12:19:01 866205 PublicationImportSpecialpage - Processing upload for DOI 10.1016/j.jcat.2026.116673-2026.08.27 to /opt/downloadPDF/chemwiki_pubstore/d716ca1fc4a4befe4e1b0f04b5e6ea30 12:19:02 866666 PublicationImportJob - prompt for AI: ht erstmal [SYSTEM-LIKE INSTRUCTIONS] You are a highly conservative scientific information extractor and formatter. Your primary goal is factual fidelity to the attached article. You must extract only what is explicitly supported by the article. Never guess, reconstruct, or “complete” missing scientific data from general chemistry knowledge. When a value is unclear, ambiguous, inconsistent, or not explicitly stated, output "not reported". Core extraction policy: - Correctness is more important than completeness. - Unit normalization must be exact. - Never confuse catalyst, photosensitizer, sacrificial electron donor, solvent, additive, proton source, irradiation wavelength, or product metric. - Values should only be converted when the article provides a clear and scientifically reliable basis for conversion. - Never infer absolute concentrations from mol% unless the absolute concentration is explicitly stated. - Never infer TON CO from yield, selectivity, graph shape, or discussion text unless the TON CO value itself is explicitly reported or unambiguously readable. - Never replace a wavelength range with a single wavelength. - Never merge data across figures, tables, or sections unless the article clearly shows that they refer to the same experiment. - Never include bibliographic metadata in the output. Formatting policy: - Follow the requested section titles exactly. - Output only the requested final formatted content. - Use "not reported" for unsupported entries. - Do not mention uncertainty analysis, self-checking, or extraction workflow in the final answer. Before finalizing, silently verify: - catalyst concentration is in µM - photosensitizer concentration is in mM - electron donor concentration is in M - excitation wavelength is in nm - TON CO refers only to CO - no unsupported claim has been added - no bibliographic metadata is present [TASK] Read the attached scientific article and convert it into a structured educational chemistry wiki entry about a molecular photocatalytic CO2 reduction system. TASK Produce a scientifically accurate, teaching-oriented summary in MediaWiki format for advanced undergraduate chemistry students. Focus strictly on the chemistry, mechanism, photocatalytic setup, components, and reported results. CONTENT RESTRICTIONS - Use only information explicitly supported by the attached article. - Do NOT include author names, affiliations, journal name, year, DOI, citation labels, references, page numbers, or any publication metadata. - Do NOT speculate. - Do NOT fill missing values from chemical intuition or standard literature practice. - Whenever a requested value is missing, ambiguous, or not explicitly reported, write: "not reported". STYLE REQUIREMENTS - Use proper MediaWiki markup. - Use accessible but precise scientific language. - Keep the explanation educational, technically correct, and chemically specific. - Avoid unnecessary jargon, but do not oversimplify. - Distinguish clearly between established experimental observations and proposed mechanistic interpretation. OUTPUT REQUIREMENTS - Return only the final MediaWiki-formatted entry. - Use exactly the section headings below, in exactly the same order. - Do not add extra sections. - The final section, "Investigation", must contain CSV data inside a plain fenced code block. Use exactly this structure: == Abstract Summary == Provide a concise overview of the scientific goal, the photocatalytic system, and the main findings. State what was converted, what kind of photocatalytic system was used, and what the main outcome was. == Advances and Special Progress == Explain the key scientific advances compared with earlier molecular photocatalytic CO2 reduction systems. Focus on scientifically meaningful progress such as: - higher activity, - improved CO selectivity, - improved compatibility with water or mixed solvents, - unusual catalyst design, - mechanistic insight, - improved durability, - use of earth-abundant components, - unusual electron-transfer design, - better coupling between catalyst and photosensitizer. Only mention advances that are supported by the article itself. == Additional Remarks == Provide important contextual remarks relevant to the chemistry and significance of the work. Examples may include: - sustainability relevance of CO2-to-CO photoreduction, - strengths and limitations of sacrificial photochemical systems, - dependence on noble-metal photosensitizers, - solvent limitations, - water tolerance, - competition with H2 evolution, - catalyst decomposition, - low long-term durability, - mechanistic elegance versus practical limitations. Keep this section balanced, factual, and chemically relevant. == Content of the Published Article in Detail == Write a clear, teaching-oriented explanation of the scientific content of the article. Include, where supported by the article: - the molecular components of the system, - how the photocatalytic experiment is set up, - what happens after light absorption by the photosensitizer, - whether reductive or oxidative quenching is proposed, - how the sacrificial electron donor participates, - how electrons are transferred to the catalyst, - what reduced catalyst states are proposed or observed, - how CO2 activation and reduction are described, - how CO is formed and released, - whether proton transfer is involved, - what side products are observed or suppressed, - what control experiments or spectroscopic/electrochemical studies support the mechanism. Mechanistic explanation rules: - Explain the mechanism in words. - Be chemically accurate. - Distinguish proposed intermediates from directly observed intermediates. - Use cautious wording where appropriate, such as "the article proposes" or "the data support". - Do not overstate mechanistic certainty. Possible supporting evidence may include: - Stern-Volmer quenching, - emission quenching, - transient absorption, - UV/Vis spectroscopy, - cyclic voltammetry, - spectroelectrochemistry, - control experiments omitting one component, - atmosphere controls, - product analysis, - catalyst comparison studies. == Catalyst == Describe the catalyst in a compact but chemically informative way. Include only details explicitly supported by the article, such as: - exact catalyst identity, - catalyst class, - metal center, - oxidation state if stated, - ligand family or coordination environment, - whether it is mononuclear, dinuclear, supramolecular, macrocyclic, polypyridyl, porphyrinic, or another named class, - whether it is molecular, immobilized, or heterogeneous, - catalytic role in CO2 reduction, - special redox or structural properties relevant to function, - selectivity-related features, - stability or decomposition issues relevant to performance. Do not invent structural details beyond what the article actually states or names. == Photosensitizer == Describe the photosensitizer in the same style. Include only details explicitly supported by the article, such as: - exact identity, - photosensitizer class, - light-harvesting role, - excited-state function, - whether it undergoes reductive or oxidative quenching, - relevant redox or photophysical properties if explicitly discussed, - why it is suitable in this system, - any stability or photobleaching issues if reported. If multiple photosensitizers are compared, identify the main one clearly and mention others only when relevant data are reported. == Investigation == Provide the core photocatalytic experiments as ONE fenced code block that starts with ```csv and ends with ```. The block must be plain CSV — no markdown table, no JSON, no text before or after it inside the block. The header row MUST be EXACTLY these columns, in this order: catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent C , solvent-ratio , additives , additives conc , feedstock gas , intensity , pH , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Quantum_yield__CO , Turnover_number__CH4 , Turnover_number__H2 , Turnover_frequency__H2 , Turnover_number__HCOOH , Turnover_frequency__HCOOH , Quantum_yield__HCOOH , H-D , H-D conc Extraction rules for the CSV: - One row per distinct experimental condition explicitly reported. Take the main photocatalytic performance table first, and add control / condition-variation rows when they are explicitly reported. Include EVERY distinct experiment — do not summarise or collapse rows. - Report numbers as bare values (no unit text) in exactly these units, converting only when the article gives a clear basis: cat conc = µM; PS conc = mM; e-D conc = M; H-D conc = M; Temperature = °C; λexc = nm; irr time = h; Turnover_frequency__* = h^-1; Quantum_yield__* = %. - catalyst, PS (photosensitizer), e-D (sacrificial electron donor), H-D (hydrogen/proton donor): use the identity (name or abbreviation) exactly as given in the article. Keep names consistent across rows. Never swap catalyst, photosensitizer, electron donor, hydrogen donor, solvent, or additive. - Turnover_number__X, Turnover_frequency__X, Quantum_yield__X are per product X (CO, CH4, H2, HCOOH). Put each product's value in its own column; never substitute CO yield, selectivity, total TON, or a value read from a graph. - For a solvent mixture, give solvent A/B/C and the ratio in solvent-ratio (for example 4:1). Keep additives out of the solvent fields. - Keep a wavelength range as a range (for example 420-650); a monochromatic source is a single nm value. - Leave a cell EMPTY only when the article does not state the value. Never invent, guess, reconstruct, or infer a value from general knowledge, figures, or discussion — every value must be explicitly supported by the article. - Do NOT use a value that appears only in the supporting information unless the main text also states it. - Never put a comma inside a cell (commas separate columns); use a space or a slash instead. - Do not add, remove, rename, or reorder columns. Before output, silently verify: section headings match exactly; no bibliographic metadata; units are as specified above; catalyst and photosensitizer are not swapped; no unsupported value was added; one row per distinct experiment. Return only the final MediaWiki entry with the CSV code block in the Investigation section. [OUTPUT SECTIONS - MANDATORY, emit ALL of them in this exact order, each as a wiki heading (== Name ==) followed by AT LEAST 30 words of substantive paper-specific content. Missing sections OR placeholder text like '' or '(...)' below a heading count as MISSING and INVALIDATE the output. Every heading MUST have real chemistry content underneath it] == Abstract Summary == == Advances and Special Progress == == Additional Remarks == == Content of the Published Article in Detail == == Catalyst == == Photosensitizer == == Investigation == The Investigation section must contain ONE fenced ```csv block with the header below as its first row. [OUTPUT FORMAT — INVESTIGATION CSV] Output the experiments as ONE fenced code block that starts with ```csv and ends with ```. The header row MUST be EXACTLY these columns, in this order: catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent-ratio , feedstock gas , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Turnover_number__H2 , Turnover_frequency__H2 , additives , Turnover_number__HCOOH , intensity , Turnover_number__CH4 , additives conc , Quantum_yield__CO , H-D , H-D conc , solvent C , Quantum_yield__HCOOH One row per distinct experiment; one value per cell; leave a cell empty only if the paper does not state it. 12:19:02 866666 AIClient - uploading files to AI: /opt/downloadPDF/chemwiki_pubstore/d716ca1fc4a4befe4e1b0f04b5e6ea30/Ferreira Jr. et al. - 2026 - Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO_6a900f1557b78.pdf, /opt/downloadPDF/chemwiki_pubstore/d716ca1fc4a4befe4e1b0f04b5e6ea30/SI_6a900f1559124.pdf 12:19:05 866666 AIClient - Uploaded file: Ferreira Jr. et al. - 2026 - Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO_6a900f1557b78.pdf, id: file-BsLxuLBh5zPweVuFnJXXSb 12:19:06 866666 AIClient - Uploaded file: SI_6a900f1559124.pdf, id: file-KQjMUptZmgcbMG3PbzcLfB 12:19:06 866666 AIClient - Request to AI with prompt: 'ht erstmal [SYSTEM-LIKE INSTRUCTIONS] You are a highly conservative scientific information extractor and formatter. Your primary goal is factual fidelity to the attached article. You must extract only what is explicitly supported by the article. Never guess, reconstruct, or “complete” missing scientific data from general chemistry knowledge. When a value is unclear, ambiguous, inconsistent, or not explicitly stated, output "not reported". Core extraction policy: - Correctness is more important than completeness. - Unit normalization must be exact. - Never confuse catalyst, photosensitizer, sacrificial electron donor, solvent, additive, proton source, irradiation wavelength, or product metric. - Values should only be converted when the article provides a clear and scientifically reliable basis for conversion. - Never infer absolute concentrations from mol% unless the absolute concentration is explicitly stated. - Never infer TON CO from yield, selectivity, graph shape, or discussion text unless the TON CO value itself is explicitly reported or unambiguously readable. - Never replace a wavelength range with a single wavelength. - Never merge data across figures, tables, or sections unless the article clearly shows that they refer to the same experiment. - Never include bibliographic metadata in the output. Formatting policy: - Follow the requested section titles exactly. - Output only the requested final formatted content. - Use "not reported" for unsupported entries. - Do not mention uncertainty analysis, self-checking, or extraction workflow in the final answer. Before finalizing, silently verify: - catalyst concentration is in µM - photosensitizer concentration is in mM - electron donor concentration is in M - excitation wavelength is in nm - TON CO refers only to CO - no unsupported claim has been added - no bibliographic metadata is present [TASK] Read the attached scientific article and convert it into a structured educational chemistry wiki entry about a molecular photocatalytic CO2 reduction system. TASK Produce a scientifically accurate, teaching-oriented summary in MediaWiki format for advanced undergraduate chemistry students. Focus strictly on the chemistry, mechanism, photocatalytic setup, components, and reported results. CONTENT RESTRICTIONS - Use only information explicitly supported by the attached article. - Do NOT include author names, affiliations, journal name, year, DOI, citation labels, references, page numbers, or any publication metadata. - Do NOT speculate. - Do NOT fill missing values from chemical intuition or standard literature practice. - Whenever a requested value is missing, ambiguous, or not explicitly reported, write: "not reported". STYLE REQUIREMENTS - Use proper MediaWiki markup. - Use accessible but precise scientific language. - Keep the explanation educational, technically correct, and chemically specific. - Avoid unnecessary jargon, but do not oversimplify. - Distinguish clearly between established experimental observations and proposed mechanistic interpretation. OUTPUT REQUIREMENTS - Return only the final MediaWiki-formatted entry. - Use exactly the section headings below, in exactly the same order. - Do not add extra sections. - The final section, "Investigation", must contain CSV data inside a plain fenced code block. Use exactly this structure: == Abstract Summary == Provide a concise overview of the scientific goal, the photocatalytic system, and the main findings. State what was converted, what kind of photocatalytic system was used, and what the main outcome was. == Advances and Special Progress == Explain the key scientific advances compared with earlier molecular photocatalytic CO2 reduction systems. Focus on scientifically meaningful progress such as: - higher activity, - improved CO selectivity, - improved compatibility with water or mixed solvents, - unusual catalyst design, - mechanistic insight, - improved durability, - use of earth-abundant components, - unusual electron-transfer design, - better coupling between catalyst and photosensitizer. Only mention advances that are supported by the article itself. == Additional Remarks == Provide important contextual remarks relevant to the chemistry and significance of the work. Examples may include: - sustainability relevance of CO2-to-CO photoreduction, - strengths and limitations of sacrificial photochemical systems, - dependence on noble-metal photosensitizers, - solvent limitations, - water tolerance, - competition with H2 evolution, - catalyst decomposition, - low long-term durability, - mechanistic elegance versus practical limitations. Keep this section balanced, factual, and chemically relevant. == Content of the Published Article in Detail == Write a clear, teaching-oriented explanation of the scientific content of the article. Include, where supported by the article: - the molecular components of the system, - how the photocatalytic experiment is set up, - what happens after light absorption by the photosensitizer, - whether reductive or oxidative quenching is proposed, - how the sacrificial electron donor participates, - how electrons are transferred to the catalyst, - what reduced catalyst states are proposed or observed, - how CO2 activation and reduction are described, - how CO is formed and released, - whether proton transfer is involved, - what side products are observed or suppressed, - what control experiments or spectroscopic/electrochemical studies support the mechanism. Mechanistic explanation rules: - Explain the mechanism in words. - Be chemically accurate. - Distinguish proposed intermediates from directly observed intermediates. - Use cautious wording where appropriate, such as "the article proposes" or "the data support". - Do not overstate mechanistic certainty. Possible supporting evidence may include: - Stern-Volmer quenching, - emission quenching, - transient absorption, - UV/Vis spectroscopy, - cyclic voltammetry, - spectroelectrochemistry, - control experiments omitting one component, - atmosphere controls, - product analysis, - catalyst comparison studies. == Catalyst == Describe the catalyst in a compact but chemically informative way. Include only details explicitly supported by the article, such as: - exact catalyst identity, - catalyst class, - metal center, - oxidation state if stated, - ligand family or coordination environment, - whether it is mononuclear, dinuclear, supramolecular, macrocyclic, polypyridyl, porphyrinic, or another named class, - whether it is molecular, immobilized, or heterogeneous, - catalytic role in CO2 reduction, - special redox or structural properties relevant to function, - selectivity-related features, - stability or decomposition issues relevant to performance. Do not invent structural details beyond what the article actually states or names. == Photosensitizer == Describe the photosensitizer in the same style. Include only details explicitly supported by the article, such as: - exact identity, - photosensitizer class, - light-harvesting role, - excited-state function, - whether it undergoes reductive or oxidative quenching, - relevant redox or photophysical properties if explicitly discussed, - why it is suitable in this system, - any stability or photobleaching issues if reported. If multiple photosensitizers are compared, identify the main one clearly and mention others only when relevant data are reported. == Investigation == Provide the core photocatalytic experiments as ONE fenced code block that starts with ```csv and ends with ```. The block must be plain CSV — no markdown table, no JSON, no text before or after it inside the block. The header row MUST be EXACTLY these columns, in this order: catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent C , solvent-ratio , additives , additives conc , feedstock gas , intensity , pH , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Quantum_yield__CO , Turnover_number__CH4 , Turnover_number__H2 , Turnover_frequency__H2 , Turnover_number__HCOOH , Turnover_frequency__HCOOH , Quantum_yield__HCOOH , H-D , H-D conc Extraction rules for the CSV: - One row per distinct experimental condition explicitly reported. Take the main photocatalytic performance table first, and add control / condition-variation rows when they are explicitly reported. Include EVERY distinct experiment — do not summarise or collapse rows. - Report numbers as bare values (no unit text) in exactly these units, converting only when the article gives a clear basis: cat conc = µM; PS conc = mM; e-D conc = M; H-D conc = M; Temperature = °C; λexc = nm; irr time = h; Turnover_frequency__* = h^-1; Quantum_yield__* = %. - catalyst, PS (photosensitizer), e-D (sacrificial electron donor), H-D (hydrogen/proton donor): use the identity (name or abbreviation) exactly as given in the article. Keep names consistent across rows. Never swap catalyst, photosensitizer, electron donor, hydrogen donor, solvent, or additive. - Turnover_number__X, Turnover_frequency__X, Quantum_yield__X are per product X (CO, CH4, H2, HCOOH). Put each product's value in its own column; never substitute CO yield, selectivity, total TON, or a value read from a graph. - For a solvent mixture, give solvent A/B/C and the ratio in solvent-ratio (for example 4:1). Keep additives out of the solvent fields. - Keep a wavelength range as a range (for example 420-650); a monochromatic source is a single nm value. - Leave a cell EMPTY only when the article does not state the value. Never invent, guess, reconstruct, or infer a value from general knowledge, figures, or discussion — every value must be explicitly supported by the article. - Do NOT use a value that appears only in the supporting information unless the main text also states it. - Never put a comma inside a cell (commas separate columns); use a space or a slash instead. - Do not add, remove, rename, or reorder columns. Before output, silently verify: section headings match exactly; no bibliographic metadata; units are as specified above; catalyst and photosensitizer are not swapped; no unsupported value was added; one row per distinct experiment. Return only the final MediaWiki entry with the CSV code block in the Investigation section. [OUTPUT SECTIONS - MANDATORY, emit ALL of them in this exact order, each as a wiki heading (== Name ==) followed by AT LEAST 30 words of substantive paper-specific content. Missing sections OR placeholder text like '' or '(...)' below a heading count as MISSING and INVALIDATE the output. Every heading MUST have real chemistry content underneath it] == Abstract Summary == == Advances and Special Progress == == Additional Remarks == == Content of the Published Article in Detail == == Catalyst == == Photosensitizer == == Investigation == The Investigation section must contain ONE fenced ```csv block with the header below as its first row. [OUTPUT FORMAT — INVESTIGATION CSV] Output the experiments as ONE fenced code block that starts with ```csv and ends with ```. The header row MUST be EXACTLY these columns, in this order: catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent-ratio , feedstock gas , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Turnover_number__H2 , Turnover_frequency__H2 , additives , Turnover_number__HCOOH , intensity , Turnover_number__CH4 , additives conc , Quantum_yield__CO , H-D , H-D conc , solvent C , Quantum_yield__HCOOH One row per distinct experiment; one value per cell; leave a cell empty only if the paper does not state it.' and documents [file-BsLxuLBh5zPweVuFnJXXSbfile-KQjMUptZmgcbMG3PbzcLfB] 12:19:59 866666 AIClient - Response from AI: == Abstract Summary == This study describes a homogeneous molecular photocatalytic system for the reduction of CO2 to CO under visible light using iron(II) bis(pyrazolyl)phenanthroline complexes as catalysts. The catalytic mixtures used a ruthenium polypyridyl photosensitizer, BIH as sacrificial electron donor, and mixed MeCN/H2O solvent under CO2 saturation. All four iron complexes were catalytically active for CO formation. The best overall catalyst under the standard comparison conditions was Fe2, which reached a reported TONCO of 1318 with 84% CO selectivity. Under lower catalyst loading, Fe2 reached much higher turnover numbers, up to 23,138 for CO, while maintaining high CO selectivity. The article also reports that water is essential for efficient catalysis, that the catalysis remains homogeneous according to mercury poisoning experiments, and that deactivation is mainly associated with deterioration of the photosensitizer rather than the iron catalyst. == Advances and Special Progress == A central advance is the introduction of a new family of iron(II) catalysts based on bis(pyrazolyl)phenanthroline ligands for visible-light-driven CO2-to-CO conversion. The article presents this ligand framework as an underexplored alternative to more established iron systems based on quaterpyridine, quinquepyridine, salophen, and related ligand sets. The work also shows that systematic ligand modification changes catalytic behavior. Neutral, electron-donating, sterically bulky, and electron-withdrawing pyrazolyl substituents were compared within a common scaffold, allowing direct structure-activity analysis. Among the tested complexes, Fe2 gave the highest activity, whereas Fe4 gave the highest CO selectivity in the series. Another important advance is the combination of high activity with mixed-solvent water compatibility. The article explicitly shows that 7.5-10% water is beneficial and in practice essential for efficient CO2 reduction, because anhydrous conditions give almost no CO. This is chemically significant because water both supports proton-coupled electron transfer and stabilizes intermediates according to the mechanistic interpretation presented. The article also emphasizes durability-related insight. Control experiments, repeated irradiation studies, UV-Vis monitoring, and replenishment of the photosensitizer support the conclusion that catalyst deactivation is not mainly due to iron catalyst collapse but instead is largely linked to photosensitizer degradation. Mercury poisoning experiments further support a homogeneous catalytic regime rather than nanoparticle-mediated catalysis. Finally, the study provides mechanistic progress by combining cyclic voltammetry, DFT, TD-DFT, and Stern-Volmer quenching analysis. The data support ligand-centered reductions on the iron complexes, identify the excited-state quenching behavior of the photosensitizer, and support a catalytic pathway in which one-electron-reduced iron species are competent for CO2 activation. == Additional Remarks == The chemistry is relevant because CO is a useful reduced carbon product and an industrial feedstock. Photochemical CO2-to-CO conversion is also a useful model reaction for studying multi-electron and proton-coupled small-molecule activation under mild conditions. At the same time, the system remains a sacrificial photochemical platform rather than a fully sustainable closed cycle. The reaction requires BIH as sacrificial electron donor and [Ru(bpy)3]2+ as photosensitizer. The article therefore demonstrates efficient catalytic chemistry, but it does not remove reliance on a noble-metal photosensitizer or sacrificial reagent. The solvent system is also important to interpret correctly. The highest activity in the standard experiments occurs in mixed MeCN/H2O rather than in dry acetonitrile. However, too much water decreases activity. The article attributes this decrease partly to the poor solubility of BIH at high water content, which limits effective quenching of the excited photosensitizer. Competition between CO formation and H2 evolution is present throughout the study. The catalysts are selective for CO under the reported conditions, but H2 remains a measurable side product. No significant CH4 or formate production was detected in the experiments described. A further practical limitation is long-term photostability. The catalytic activity rises quickly at early irradiation times and then approaches a plateau. The article links this behavior mainly to photosensitizer photodegradation, supported by hypochromism in UV-Vis spectra and by recovery of activity after photosensitizer replenishment. == Content of the Published Article in Detail == The molecular photocatalytic system contains four closely related iron(II) complexes, designated Fe1-Fe4, each bearing a tetradentate bis(pyrazolyl)phenanthroline ligand and two coordinated water molecules. The catalysts are molecular, homogeneous iron complexes in distorted octahedral coordination environments. The standard photocatalytic mixture also contains [Ru(bpy)3]2+ as photosensitizer and BIH as sacrificial electron donor in CO2-saturated MeCN/H2O. The photocatalytic experiments were carried out in a borosilicate photoreactor containing 4.0 mL of solution, irradiated with blue light centered at 462 nm. Under the standard catalyst comparison conditions, the mixture contained 50 μM iron catalyst, 0.3 mM [Ru(bpy)3]2+, and 0.11 M BIH in CO2-saturated MeCN/H2O. Product analysis of the gas phase was performed by gas chromatography. CO and H2 were observed. The article states that no significant formate or CH4 was detected. The photophysical analysis shows that the strong UV absorption bands of the iron complexes are mainly ligand-centered π-π* transitions. Weak lower-energy absorptions near 450-480 nm were assigned to forbidden transitions. The article explicitly states that these data do not indicate intrinsic photosensitizing ability of the iron complexes under the catalytic conditions. Instead, light absorption is carried by the ruthenium photosensitizer. Mechanistically, the article combines DFT and Stern-Volmer analysis to discuss excited-state electron transfer. The HOMO of BIH is calculated above that of [Ru(bpy)3]2+, which supports reductive quenching of the excited ruthenium photosensitizer by BIH. Stern-Volmer measurements also show that BIH quenches the emission of [Ru(bpy)3]2+ more efficiently than the iron complexes do. The article therefore identifies BIH as the dominant quencher of the excited photosensitizer. The iron complexes can also quench the excited state of [Ru(bpy)3]2+, but less efficiently. The energy-level discussion in the article indicates that oxidative quenching of the excited photosensitizer by the iron complexes is energetically feasible, whereas reductive quenching by the iron complexes is not favored. Even so, the article cautions that quenching efficiency alone should not be equated directly with catalytic efficiency. Electrochemical studies are central to the mechanistic interpretation. All four iron complexes show two reduction waves in acetonitrile. The article considers whether these are metal-centered or ligand-centered reductions and concludes, based on DFT orbital analysis and electrochemical trends, that the reductions are predominantly ligand-centered. The lowest semi-unoccupied orbitals have limited iron character and are mainly distributed over the ligand framework. Additional cyclic voltammetry under a restricted potential window showed that the first one-electron reduction is accessible within the reducing power available from the photosensitizer system. Under CO2, the voltammetric responses differ from those under Ar, and the article interprets this as evidence that the one-electron-reduced iron species react with CO2 to form intermediates that are not simply re-oxidized on the return scan. Thus, the data support the proposal that singly reduced iron complexes are catalytically relevant states for CO2 activation. The article does not directly observe all catalytic intermediates, but it proposes a chemically consistent pathway. After photoexcitation of [Ru(bpy)3]2+, BIH reductively quenches the excited state. The reduced photosensitizer can then transfer an electron to the iron complex, generating reduced catalyst states. The electrochemical and computational data support these as ligand-centered reduced species rather than formal low-valent iron states. CO2 activation is proposed to occur at the reduced iron complex. The article specifically discusses the importance of proton-coupled electron transfer and the stabilizing role of water. It states that water can stabilize metal-CO2 intermediates through hydrogen bonding and also act as a proton donor. In the mechanistic discussion, Fe-CO2 adducts and Fe-COOH-type intermediates are invoked conceptually, but these are proposed intermediates rather than directly isolated species. The role of water is strongly supported experimentally. In anhydrous MeCN, the system produced very little CO. Addition of 7.5% water caused a large increase in both CO production and selectivity, and 10% water gave similarly strong performance. Higher water fractions decreased activity. The article interprets this as a balance between beneficial proton delivery and intermediate stabilization on one hand, and unfavorable BIH solubility and quenching behavior on the other. Several control experiments support the overall catalytic assignment. In the absence of light, catalyst, photosensitizer, sacrificial donor, or CO2, no significant catalytic CO production occurred. Use of Fe(ClO4)2 instead of the molecular iron complex gave only minor CO and H2 formation, showing that free Fe2+ is not responsible for the reported activity. Under Ar instead of CO2, CO production was not significant. The homogeneous nature of the catalysis was examined by mercury poisoning. The addition of a large excess of mercury did not suppress the observed CO production under the tested conditions, which the article takes as evidence against catalysis by iron nanoparticles or colloidal metallic species. The authors therefore assign the active system as homogeneous. Catalyst robustness was examined by time-course experiments and photosensitizer replenishment. Catalytic activity increased strongly at early times and then plateaued. UV-Vis monitoring of the reaction mixture showed hypochromism attributed to photosensitizer deterioration. When additional [Ru(bpy)3]2+ was added after 24 h, CO production resumed, supporting the conclusion that photosensitizer degradation is the main source of deactivation, while the iron catalyst remains comparatively robust under the reported conditions. == Catalyst == The catalysts are a series of molecular iron(II) bis(pyrazolyl)phenanthroline complexes, labeled Fe1, Fe2, Fe3, and Fe4. They are homogeneous mononuclear iron complexes containing tetradentate bis(pyrazolyl)phenanthroline ligands and two coordinated water ligands, formulated as [Fe(bpzRphen)(H2O)2]X2 with different pyrazolyl substituents. All four complexes were reported to have high-spin quintet ground states and distorted octahedral geometries. Magnetic susceptibility measurements supported high-spin Fe(II), and DFT calculations agreed with a quintet ground state for the series. The coordinated ligand framework controls the redox behavior, and the article concludes that the accessible reductions are predominantly ligand-centered. The four ligand variants were designed to compare different substituent effects: unsubstituted pyrazolyl, dimethyl-substituted pyrazolyl, diphenyl-substituted pyrazolyl, and trifluoromethyl-substituted pyrazolyl. These modifications changed both activity and selectivity. Fe2, the dimethyl-substituted complex, gave the highest overall activity under the standard comparison conditions and also the highest reported TONCO at low catalyst loading. Fe4, the trifluoromethyl-substituted complex, gave the highest CO selectivity in the standard series comparison. The article further notes a structural feature for Fe4: weak intramolecular hydrogen-bonding interactions between coordinated water ligands and fluorine atoms of the CF3 substituents. The authors suggest that such contacts may help proton management around the metal center and may contribute to the enhanced CO selectivity of Fe4. This is presented as an interpretation based on calculated structure rather than direct proof of the catalytic origin of selectivity. The catalysts are described as robust under the reported photocatalytic conditions, but not perfectly immutable. The study indicates that deactivation mainly arises from photosensitizer deterioration rather than dominant catalyst decomposition. Mercury poisoning tests support a homogeneous molecular catalytic regime rather than conversion into heterogeneous iron particles. == Photosensitizer == The photosensitizer is [Ru(bpy)3]2+. It serves as the visible-light absorber and initiates the photoredox sequence required for electron delivery to the iron catalyst. The experiments used this ruthenium complex at 0.3 mM in the photocatalytic mixtures. The article discusses the excited state as the metal-to-ligand charge-transfer triplet state of the ruthenium complex. Stern-Volmer emission quenching experiments show that BIH efficiently quenches this excited state, with a quenching rate constant on the order of 1010 M−1 s−1. This supports a dominant reductive quenching pathway by BIH. The iron catalysts also quench the excited state of [Ru(bpy)3]2+, but much less efficiently than BIH. The article therefore treats BIH as the main quencher in the working catalytic system. DFT-based energy-level alignment is used to rationalize the relative feasibility of reductive and oxidative quenching pathways. A key limitation of the photosensitizer in this system is durability. UV-Vis monitoring during irradiation showed loss of the characteristic ruthenium absorption, interpreted as photosensitizer degradation. Additional support comes from the restoration of CO production after replenishment of [Ru(bpy)3]2+. Thus, the photosensitizer is chemically suitable for visible-light activation but is also identified as the main weak point in long-duration catalysis. == Investigation == ```csv catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent C , solvent-ratio , additives , additives conc , feedstock gas , intensity , pH , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Quantum_yield__CO , Turnover_number__CH4 , Turnover_number__H2 , Turnover_frequency__H2 , Turnover_number__HCOOH , Turnover_frequency__HCOOH , Quantum_yield__HCOOH , H-D , H-D conc Fe1 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 987 , 41.1 , not reported , not reported , 187 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 1318 , 54.9 , not reported , not reported , 243 , not reported , not reported , not reported , not reported , H2O , not reported Fe3 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 847 , 35.3 , not reported , not reported , 205 , not reported , not reported , not reported , not reported , H2O , not reported Fe4 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 1265 , 52.7 , not reported , not reported , 133 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 4 , 311 , 77.7 , not reported , not reported , 51 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 48 , 1578 , 32.9 , not reported , not reported , 296 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 96 , 1593 , 16.6 , not reported , not reported , 300 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 2 , not reported , not reported , not reported , 22 , not reported , not reported , not reported , not reported , , Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 1352 , 56.3 , not reported , not reported , 285 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 661 , 27.5 , not reported , not reported , 191 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 621 , 25.8 , not reported , not reported , 77 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 25 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 2086 , 86.9 , not reported , not reported , 123 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 12.5 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 4259 , 177.4 , not reported , not reported , 276 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 6.25 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 10168 , 423.7 , not reported , not reported , 862 , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 3.12 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 24 , 23138 , 964.1 , not reported , not reported , 2177 , not reported , not reported , not reported , not reported , H2O , not reported Fe1 , 3.12 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 4 , not reported , not reported , 4.70 , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported Fe2 , 3.12 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 4 , not reported , not reported , 7.58 , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported Fe3 , 3.12 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 4 , not reported , not reported , 3.76 , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported Fe4 , 3.12 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , , not reported , , , CO2 , not reported , not reported , 35 , 462 , 4 , not reported , not reported , 7.25 , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported ``` 12:20:02 866666 PublicationImportJob - created investigation page: Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO2-to-CO conversion under visible light - 2026.08.27/inv0 12:20:02 866666 PublicationImportJob - generated text from AI: Imported from: /opt/downloadPDF/chemwiki_pubstore/d716ca1fc4a4befe4e1b0f04b5e6ea30/Ferreira Jr. et al. - 2026 - Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO_6a900f1557b78.pdf, /opt/downloadPDF/chemwiki_pubstore/d716ca1fc4a4befe4e1b0f04b5e6ea30/SI_6a900f1559124.pdf {{BaseTemplate}} {{DOI|doi=10.1016/j.jcat.2026.116673-2026.08.27}} == Abstract Summary == This study describes a homogeneous molecular photocatalytic system for the reduction of CO2 to CO under visible light using iron(II) bis(pyrazolyl)phenanthroline complexes as catalysts. The catalytic mixtures used a ruthenium polypyridyl photosensitizer, BIH as sacrificial electron donor, and mixed MeCN/H2O solvent under CO2 saturation. All four iron complexes were catalytically active for CO formation. The best overall catalyst under the standard comparison conditions was Fe2, which reached a reported TONCO of 1318 with 84% CO selectivity. Under lower catalyst loading, Fe2 reached much higher turnover numbers, up to 23,138 for CO, while maintaining high CO selectivity. The article also reports that water is essential for efficient catalysis, that the catalysis remains homogeneous according to mercury poisoning experiments, and that deactivation is mainly associated with deterioration of the photosensitizer rather than the iron catalyst. == Advances and Special Progress == A central advance is the introduction of a new family of iron(II) catalysts based on bis(pyrazolyl)phenanthroline ligands for visible-light-driven CO2-to-CO conversion. The article presents this ligand framework as an underexplored alternative to more established iron systems based on quaterpyridine, quinquepyridine, salophen, and related ligand sets. The work also shows that systematic ligand modification changes catalytic behavior. Neutral, electron-donating, sterically bulky, and electron-withdrawing pyrazolyl substituents were compared within a common scaffold, allowing direct structure-activity analysis. Among the tested complexes, Fe2 gave the highest activity, whereas Fe4 gave the highest CO selectivity in the series. Another important advance is the combination of high activity with mixed-solvent water compatibility. The article explicitly shows that 7.5-10% water is beneficial and in practice essential for efficient CO2 reduction, because anhydrous conditions give almost no CO. This is chemically significant because water both supports proton-coupled electron transfer and stabilizes intermediates according to the mechanistic interpretation presented. The article also emphasizes durability-related insight. Control experiments, repeated irradiation studies, UV-Vis monitoring, and replenishment of the photosensitizer support the conclusion that catalyst deactivation is not mainly due to iron catalyst collapse but instead is largely linked to photosensitizer degradation. Mercury poisoning experiments further support a homogeneous catalytic regime rather than nanoparticle-mediated catalysis. Finally, the study provides mechanistic progress by combining cyclic voltammetry, DFT, TD-DFT, and Stern-Volmer quenching analysis. The data support ligand-centered reductions on the iron complexes, identify the excited-state quenching behavior of the photosensitizer, and support a catalytic pathway in which one-electron-reduced iron species are competent for CO2 activation. == Additional Remarks == The chemistry is relevant because CO is a useful reduced carbon product and an industrial feedstock. Photochemical CO2-to-CO conversion is also a useful model reaction for studying multi-electron and proton-coupled small-molecule activation under mild conditions. At the same time, the system remains a sacrificial photochemical platform rather than a fully sustainable closed cycle. The reaction requires BIH as sacrificial electron donor and [Ru(bpy)3]2+ as photosensitizer. The article therefore demonstrates efficient catalytic chemistry, but it does not remove reliance on a noble-metal photosensitizer or sacrificial reagent. The solvent system is also important to interpret correctly. The highest activity in the standard experiments occurs in mixed MeCN/H2O rather than in dry acetonitrile. However, too much water decreases activity. The article attributes this decrease partly to the poor solubility of BIH at high water content, which limits effective quenching of the excited photosensitizer. Competition between CO formation and H2 evolution is present throughout the study. The catalysts are selective for CO under the reported conditions, but H2 remains a measurable side product. No significant CH4 or formate production was detected in the experiments described. A further practical limitation is long-term photostability. The catalytic activity rises quickly at early irradiation times and then approaches a plateau. The article links this behavior mainly to photosensitizer photodegradation, supported by hypochromism in UV-Vis spectra and by recovery of activity after photosensitizer replenishment. == Content of the Published Article in Detail == The molecular photocatalytic system contains four closely related iron(II) complexes, designated Fe1-Fe4, each bearing a tetradentate bis(pyrazolyl)phenanthroline ligand and two coordinated water molecules. The catalysts are molecular, homogeneous iron complexes in distorted octahedral coordination environments. The standard photocatalytic mixture also contains [Ru(bpy)3]2+ as photosensitizer and BIH as sacrificial electron donor in CO2-saturated MeCN/H2O. The photocatalytic experiments were carried out in a borosilicate photoreactor containing 4.0 mL of solution, irradiated with blue light centered at 462 nm. Under the standard catalyst comparison conditions, the mixture contained 50 μM iron catalyst, 0.3 mM [Ru(bpy)3]2+, and 0.11 M BIH in CO2-saturated MeCN/H2O. Product analysis of the gas phase was performed by gas chromatography. CO and H2 were observed. The article states that no significant formate or CH4 was detected. The photophysical analysis shows that the strong UV absorption bands of the iron complexes are mainly ligand-centered π-π* transitions. Weak lower-energy absorptions near 450-480 nm were assigned to forbidden transitions. The article explicitly states that these data do not indicate intrinsic photosensitizing ability of the iron complexes under the catalytic conditions. Instead, light absorption is carried by the ruthenium photosensitizer. Mechanistically, the article combines DFT and Stern-Volmer analysis to discuss excited-state electron transfer. The HOMO of BIH is calculated above that of [Ru(bpy)3]2+, which supports reductive quenching of the excited ruthenium photosensitizer by BIH. Stern-Volmer measurements also show that BIH quenches the emission of [Ru(bpy)3]2+ more efficiently than the iron complexes do. The article therefore identifies BIH as the dominant quencher of the excited photosensitizer. The iron complexes can also quench the excited state of [Ru(bpy)3]2+, but less efficiently. The energy-level discussion in the article indicates that oxidative quenching of the excited photosensitizer by the iron complexes is energetically feasible, whereas reductive quenching by the iron complexes is not favored. Even so, the article cautions that quenching efficiency alone should not be equated directly with catalytic efficiency. Electrochemical studies are central to the mechanistic interpretation. All four iron complexes show two reduction waves in acetonitrile. The article considers whether these are metal-centered or ligand-centered reductions and concludes, based on DFT orbital analysis and electrochemical trends, that the reductions are predominantly ligand-centered. The lowest semi-unoccupied orbitals have limited iron character and are mainly distributed over the ligand framework. Additional cyclic voltammetry under a restricted potential window showed that the first one-electron reduction is accessible within the reducing power available from the photosensitizer system. Under CO2, the voltammetric responses differ from those under Ar, and the article interprets this as evidence that the one-electron-reduced iron species react with CO2 to form intermediates that are not simply re-oxidized on the return scan. Thus, the data support the proposal that singly reduced iron complexes are catalytically relevant states for CO2 activation. The article does not directly observe all catalytic intermediates, but it proposes a chemically consistent pathway. After photoexcitation of [Ru(bpy)3]2+, BIH reductively quenches the excited state. The reduced photosensitizer can then transfer an electron to the iron complex, generating reduced catalyst states. The electrochemical and computational data support these as ligand-centered reduced species rather than formal low-valent iron states. CO2 activation is proposed to occur at the reduced iron complex. The article specifically discusses the importance of proton-coupled electron transfer and the stabilizing role of water. It states that water can stabilize metal-CO2 intermediates through hydrogen bonding and also act as a proton donor. In the mechanistic discussion, Fe-CO2 adducts and Fe-COOH-type intermediates are invoked conceptually, but these are proposed intermediates rather than directly isolated species. The role of water is strongly supported experimentally. In anhydrous MeCN, the system produced very little CO. Addition of 7.5% water caused a large increase in both CO production and selectivity, and 10% water gave similarly strong performance. Higher water fractions decreased activity. The article interprets this as a balance between beneficial proton delivery and intermediate stabilization on one hand, and unfavorable BIH solubility and quenching behavior on the other. Several control experiments support the overall catalytic assignment. In the absence of light, catalyst, photosensitizer, sacrificial donor, or CO2, no significant catalytic CO production occurred. Use of Fe(ClO4)2 instead of the molecular iron complex gave only minor CO and H2 formation, showing that free Fe2+ is not responsible for the reported activity. Under Ar instead of CO2, CO production was not significant. The homogeneous nature of the catalysis was examined by mercury poisoning. The addition of a large excess of mercury did not suppress the observed CO production under the tested conditions, which the article takes as evidence against catalysis by iron nanoparticles or colloidal metallic species. The authors therefore assign the active system as homogeneous. Catalyst robustness was examined by time-course experiments and photosensitizer replenishment. Catalytic activity increased strongly at early times and then plateaued. UV-Vis monitoring of the reaction mixture showed hypochromism attributed to photosensitizer deterioration. When additional [Ru(bpy)3]2+ was added after 24 h, CO production resumed, supporting the conclusion that photosensitizer degradation is the main source of deactivation, while the iron catalyst remains comparatively robust under the reported conditions. == Catalyst == The catalysts are a series of molecular iron(II) bis(pyrazolyl)phenanthroline complexes, labeled Fe1, Fe2, Fe3, and Fe4. They are homogeneous mononuclear iron complexes containing tetradentate bis(pyrazolyl)phenanthroline ligands and two coordinated water ligands, formulated as [Fe(bpzRphen)(H2O)2]X2 with different pyrazolyl substituents. All four complexes were reported to have high-spin quintet ground states and distorted octahedral geometries. Magnetic susceptibility measurements supported high-spin Fe(II), and DFT calculations agreed with a quintet ground state for the series. The coordinated ligand framework controls the redox behavior, and the article concludes that the accessible reductions are predominantly ligand-centered. The four ligand variants were designed to compare different substituent effects: unsubstituted pyrazolyl, dimethyl-substituted pyrazolyl, diphenyl-substituted pyrazolyl, and trifluoromethyl-substituted pyrazolyl. These modifications changed both activity and selectivity. Fe2, the dimethyl-substituted complex, gave the highest overall activity under the standard comparison conditions and also the highest reported TONCO at low catalyst loading. Fe4, the trifluoromethyl-substituted complex, gave the highest CO selectivity in the standard series comparison. The article further notes a structural feature for Fe4: weak intramolecular hydrogen-bonding interactions between coordinated water ligands and fluorine atoms of the CF3 substituents. The authors suggest that such contacts may help proton management around the metal center and may contribute to the enhanced CO selectivity of Fe4. This is presented as an interpretation based on calculated structure rather than direct proof of the catalytic origin of selectivity. The catalysts are described as robust under the reported photocatalytic conditions, but not perfectly immutable. The study indicates that deactivation mainly arises from photosensitizer deterioration rather than dominant catalyst decomposition. Mercury poisoning tests support a homogeneous molecular catalytic regime rather than conversion into heterogeneous iron particles. == Photosensitizer == The photosensitizer is [Ru(bpy)3]2+. It serves as the visible-light absorber and initiates the photoredox sequence required for electron delivery to the iron catalyst. The experiments used this ruthenium complex at 0.3 mM in the photocatalytic mixtures. The article discusses the excited state as the metal-to-ligand charge-transfer triplet state of the ruthenium complex. Stern-Volmer emission quenching experiments show that BIH efficiently quenches this excited state, with a quenching rate constant on the order of 1010 M−1 s−1. This supports a dominant reductive quenching pathway by BIH. The iron catalysts also quench the excited state of [Ru(bpy)3]2+, but much less efficiently than BIH. The article therefore treats BIH as the main quencher in the working catalytic system. DFT-based energy-level alignment is used to rationalize the relative feasibility of reductive and oxidative quenching pathways. A key limitation of the photosensitizer in this system is durability. UV-Vis monitoring during irradiation showed loss of the characteristic ruthenium absorption, interpreted as photosensitizer degradation. Additional support comes from the restoration of CO production after replenishment of [Ru(bpy)3]2+. Thus, the photosensitizer is chemically suitable for visible-light activation but is also identified as the main weak point in long-duration catalysis. == Investigation == {{#experimentlist:|form=Photocatalytic_CO2_conversion_experiments|name=inv0}} [[Category:Photocatalytic CO2 conversion]] 12:20:05 866666 AIClient - File deleted from OpenAI repo: file-BsLxuLBh5zPweVuFnJXXSb 12:20:06 866666 AIClient - File deleted from OpenAI repo: file-KQjMUptZmgcbMG3PbzcLfB 15:10:56 873626 PublicationImportSpecialpage - Processing upload for DOI 10.1016/j.jcat.2026.116673-2026.08.27-2 to /opt/downloadPDF/chemwiki_pubstore/dd3ba84003829bc12df0acc251f953eb 15:11:02 873805 PublicationImportJob - prompt for AI: ht erstmal [SYSTEM-LIKE INSTRUCTIONS] You are a highly conservative scientific information extractor and formatter. Your primary goal is factual fidelity to the attached article. You must extract only what is explicitly supported by the article. Never guess, reconstruct, or “complete” missing scientific data from general chemistry knowledge. When a value is unclear, ambiguous, inconsistent, or not explicitly stated, output "not reported". Core extraction policy: - Correctness is more important than completeness. - Unit normalization must be exact. - Never confuse catalyst, photosensitizer, sacrificial electron donor, solvent, additive, proton source, irradiation wavelength, or product metric. - Values should only be converted when the article provides a clear and scientifically reliable basis for conversion. - Never infer absolute concentrations from mol% unless the absolute concentration is explicitly stated. - Never infer TON CO from yield, selectivity, graph shape, or discussion text unless the TON CO value itself is explicitly reported or unambiguously readable. - Never replace a wavelength range with a single wavelength. - Never merge data across figures, tables, or sections unless the article clearly shows that they refer to the same experiment. - Never include bibliographic metadata in the output. Formatting policy: - Follow the requested section titles exactly. - Output only the requested final formatted content. - Use "not reported" for unsupported entries. - Do not mention uncertainty analysis, self-checking, or extraction workflow in the final answer. Before finalizing, silently verify: - catalyst concentration is in µM - photosensitizer concentration is in mM - electron donor concentration is in M - excitation wavelength is in nm - TON CO refers only to CO - no unsupported claim has been added - no bibliographic metadata is present [TASK] Read the attached scientific article and convert it into a structured educational chemistry wiki entry about a molecular photocatalytic CO2 reduction system. TASK Produce a scientifically accurate, teaching-oriented summary in MediaWiki format for advanced undergraduate chemistry students. Focus strictly on the chemistry, mechanism, photocatalytic setup, components, and reported results. CONTENT RESTRICTIONS - Use only information explicitly supported by the attached article. - Do NOT include author names, affiliations, journal name, year, DOI, citation labels, references, page numbers, or any publication metadata. - Do NOT speculate. - Do NOT fill missing values from chemical intuition or standard literature practice. - Whenever a requested value is missing, ambiguous, or not explicitly reported, write: "not reported". STYLE REQUIREMENTS - Use proper MediaWiki markup. - Use accessible but precise scientific language. - Keep the explanation educational, technically correct, and chemically specific. - Avoid unnecessary jargon, but do not oversimplify. - Distinguish clearly between established experimental observations and proposed mechanistic interpretation. OUTPUT REQUIREMENTS - Return only the final MediaWiki-formatted entry. - Use exactly the section headings below, in exactly the same order. - Do not add extra sections. - The final section, "Investigation", must contain CSV data inside a plain fenced code block. Use exactly this structure: == Abstract Summary == Provide a concise overview of the scientific goal, the photocatalytic system, and the main findings. State what was converted, what kind of photocatalytic system was used, and what the main outcome was. == Advances and Special Progress == Explain the key scientific advances compared with earlier molecular photocatalytic CO2 reduction systems. Focus on scientifically meaningful progress such as: - higher activity, - improved CO selectivity, - improved compatibility with water or mixed solvents, - unusual catalyst design, - mechanistic insight, - improved durability, - use of earth-abundant components, - unusual electron-transfer design, - better coupling between catalyst and photosensitizer. Only mention advances that are supported by the article itself. == Additional Remarks == Provide important contextual remarks relevant to the chemistry and significance of the work. Examples may include: - sustainability relevance of CO2-to-CO photoreduction, - strengths and limitations of sacrificial photochemical systems, - dependence on noble-metal photosensitizers, - solvent limitations, - water tolerance, - competition with H2 evolution, - catalyst decomposition, - low long-term durability, - mechanistic elegance versus practical limitations. Keep this section balanced, factual, and chemically relevant. == Content of the Published Article in Detail == Write a clear, teaching-oriented explanation of the scientific content of the article. Include, where supported by the article: - the molecular components of the system, - how the photocatalytic experiment is set up, - what happens after light absorption by the photosensitizer, - whether reductive or oxidative quenching is proposed, - how the sacrificial electron donor participates, - how electrons are transferred to the catalyst, - what reduced catalyst states are proposed or observed, - how CO2 activation and reduction are described, - how CO is formed and released, - whether proton transfer is involved, - what side products are observed or suppressed, - what control experiments or spectroscopic/electrochemical studies support the mechanism. Mechanistic explanation rules: - Explain the mechanism in words. - Be chemically accurate. - Distinguish proposed intermediates from directly observed intermediates. - Use cautious wording where appropriate, such as "the article proposes" or "the data support". - Do not overstate mechanistic certainty. Possible supporting evidence may include: - Stern-Volmer quenching, - emission quenching, - transient absorption, - UV/Vis spectroscopy, - cyclic voltammetry, - spectroelectrochemistry, - control experiments omitting one component, - atmosphere controls, - product analysis, - catalyst comparison studies. == Catalyst == Describe the catalyst in a compact but chemically informative way. Include only details explicitly supported by the article, such as: - exact catalyst identity, - catalyst class, - metal center, - oxidation state if stated, - ligand family or coordination environment, - whether it is mononuclear, dinuclear, supramolecular, macrocyclic, polypyridyl, porphyrinic, or another named class, - whether it is molecular, immobilized, or heterogeneous, - catalytic role in CO2 reduction, - special redox or structural properties relevant to function, - selectivity-related features, - stability or decomposition issues relevant to performance. Do not invent structural details beyond what the article actually states or names. == Photosensitizer == Describe the photosensitizer in the same style. Include only details explicitly supported by the article, such as: - exact identity, - photosensitizer class, - light-harvesting role, - excited-state function, - whether it undergoes reductive or oxidative quenching, - relevant redox or photophysical properties if explicitly discussed, - why it is suitable in this system, - any stability or photobleaching issues if reported. If multiple photosensitizers are compared, identify the main one clearly and mention others only when relevant data are reported. == Investigation == Provide the core photocatalytic experiments as ONE fenced code block that starts with ```csv and ends with ```. The block must be plain CSV — no markdown table, no JSON, no text before or after it inside the block. The header row MUST be EXACTLY these columns, in this order: catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent C , solvent-ratio , additives , additives conc , feedstock gas , intensity , pH , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Quantum_yield__CO , Turnover_number__CH4 , Turnover_number__H2 , Turnover_frequency__H2 , Turnover_number__HCOOH , Turnover_frequency__HCOOH , Quantum_yield__HCOOH , H-D , H-D conc Extraction rules for the CSV: - One row per distinct experimental condition explicitly reported. Take the main photocatalytic performance table first, and add control / condition-variation rows when they are explicitly reported. Include EVERY distinct experiment — do not summarise or collapse rows. - Report numbers as bare values (no unit text) in exactly these units, converting only when the article gives a clear basis: cat conc = µM; PS conc = mM; e-D conc = M; H-D conc = M; Temperature = °C; λexc = nm; irr time = h; Turnover_frequency__* = h^-1; Quantum_yield__* = %. - catalyst, PS (photosensitizer), e-D (sacrificial electron donor), H-D (hydrogen/proton donor): use the identity (name or abbreviation) exactly as given in the article. Keep names consistent across rows. Never swap catalyst, photosensitizer, electron donor, hydrogen donor, solvent, or additive. - Turnover_number__X, Turnover_frequency__X, Quantum_yield__X are per product X (CO, CH4, H2, HCOOH). Put each product's value in its own column; never substitute CO yield, selectivity, total TON, or a value read from a graph. - For a solvent mixture, give solvent A/B/C and the ratio in solvent-ratio (for example 4:1). Keep additives out of the solvent fields. - Keep a wavelength range as a range (for example 420-650); a monochromatic source is a single nm value. - Leave a cell EMPTY only when the article does not state the value. Never invent, guess, reconstruct, or infer a value from general knowledge, figures, or discussion — every value must be explicitly supported by the article. - Do NOT use a value that appears only in the supporting information unless the main text also states it. - Never put a comma inside a cell (commas separate columns); use a space or a slash instead. - Do not add, remove, rename, or reorder columns. Before output, silently verify: section headings match exactly; no bibliographic metadata; units are as specified above; catalyst and photosensitizer are not swapped; no unsupported value was added; one row per distinct experiment. Return only the final MediaWiki entry with the CSV code block in the Investigation section. [OUTPUT SECTIONS - MANDATORY, emit ALL of them in this exact order, each as a wiki heading (== Name ==) followed by AT LEAST 30 words of substantive paper-specific content. Missing sections OR placeholder text like '' or '(...)' below a heading count as MISSING and INVALIDATE the output. Every heading MUST have real chemistry content underneath it] == Abstract Summary == == Advances and Special Progress == == Additional Remarks == == Content of the Published Article in Detail == == Catalyst == == Photosensitizer == == Investigation == The Investigation section must contain ONE fenced ```csv block with the header below as its first row. [OUTPUT FORMAT — INVESTIGATION CSV] Output the experiments as ONE fenced code block that starts with ```csv and ends with ```. The header row MUST be EXACTLY these columns, in this order: catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent-ratio , feedstock gas , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Turnover_number__H2 , Turnover_frequency__H2 , additives , Turnover_number__HCOOH , intensity , Turnover_number__CH4 , additives conc , Quantum_yield__CO , H-D , H-D conc , solvent C , Quantum_yield__HCOOH One row per distinct experiment; one value per cell; leave a cell empty only if the paper does not state it. 15:11:02 873805 AIClient - uploading files to AI: /opt/downloadPDF/chemwiki_pubstore/dd3ba84003829bc12df0acc251f953eb/Ferreira Jr. et al. - 2026 - Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO_6a9037604bf2e.pdf, /opt/downloadPDF/chemwiki_pubstore/dd3ba84003829bc12df0acc251f953eb/SI_6a9037604d3e3.pdf 15:11:04 873805 AIClient - Uploaded file: Ferreira Jr. et al. - 2026 - Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO_6a9037604bf2e.pdf, id: file-FaFrz7zc3JLdHPHsUscPHF 15:11:06 873805 AIClient - Uploaded file: SI_6a9037604d3e3.pdf, id: file-Tr7QPEKQjFQEi5UTak9pH8 15:11:06 873805 AIClient - Request to AI with prompt: 'ht erstmal [SYSTEM-LIKE INSTRUCTIONS] You are a highly conservative scientific information extractor and formatter. Your primary goal is factual fidelity to the attached article. You must extract only what is explicitly supported by the article. Never guess, reconstruct, or “complete” missing scientific data from general chemistry knowledge. When a value is unclear, ambiguous, inconsistent, or not explicitly stated, output "not reported". Core extraction policy: - Correctness is more important than completeness. - Unit normalization must be exact. - Never confuse catalyst, photosensitizer, sacrificial electron donor, solvent, additive, proton source, irradiation wavelength, or product metric. - Values should only be converted when the article provides a clear and scientifically reliable basis for conversion. - Never infer absolute concentrations from mol% unless the absolute concentration is explicitly stated. - Never infer TON CO from yield, selectivity, graph shape, or discussion text unless the TON CO value itself is explicitly reported or unambiguously readable. - Never replace a wavelength range with a single wavelength. - Never merge data across figures, tables, or sections unless the article clearly shows that they refer to the same experiment. - Never include bibliographic metadata in the output. Formatting policy: - Follow the requested section titles exactly. - Output only the requested final formatted content. - Use "not reported" for unsupported entries. - Do not mention uncertainty analysis, self-checking, or extraction workflow in the final answer. Before finalizing, silently verify: - catalyst concentration is in µM - photosensitizer concentration is in mM - electron donor concentration is in M - excitation wavelength is in nm - TON CO refers only to CO - no unsupported claim has been added - no bibliographic metadata is present [TASK] Read the attached scientific article and convert it into a structured educational chemistry wiki entry about a molecular photocatalytic CO2 reduction system. TASK Produce a scientifically accurate, teaching-oriented summary in MediaWiki format for advanced undergraduate chemistry students. Focus strictly on the chemistry, mechanism, photocatalytic setup, components, and reported results. CONTENT RESTRICTIONS - Use only information explicitly supported by the attached article. - Do NOT include author names, affiliations, journal name, year, DOI, citation labels, references, page numbers, or any publication metadata. - Do NOT speculate. - Do NOT fill missing values from chemical intuition or standard literature practice. - Whenever a requested value is missing, ambiguous, or not explicitly reported, write: "not reported". STYLE REQUIREMENTS - Use proper MediaWiki markup. - Use accessible but precise scientific language. - Keep the explanation educational, technically correct, and chemically specific. - Avoid unnecessary jargon, but do not oversimplify. - Distinguish clearly between established experimental observations and proposed mechanistic interpretation. OUTPUT REQUIREMENTS - Return only the final MediaWiki-formatted entry. - Use exactly the section headings below, in exactly the same order. - Do not add extra sections. - The final section, "Investigation", must contain CSV data inside a plain fenced code block. Use exactly this structure: == Abstract Summary == Provide a concise overview of the scientific goal, the photocatalytic system, and the main findings. State what was converted, what kind of photocatalytic system was used, and what the main outcome was. == Advances and Special Progress == Explain the key scientific advances compared with earlier molecular photocatalytic CO2 reduction systems. Focus on scientifically meaningful progress such as: - higher activity, - improved CO selectivity, - improved compatibility with water or mixed solvents, - unusual catalyst design, - mechanistic insight, - improved durability, - use of earth-abundant components, - unusual electron-transfer design, - better coupling between catalyst and photosensitizer. Only mention advances that are supported by the article itself. == Additional Remarks == Provide important contextual remarks relevant to the chemistry and significance of the work. Examples may include: - sustainability relevance of CO2-to-CO photoreduction, - strengths and limitations of sacrificial photochemical systems, - dependence on noble-metal photosensitizers, - solvent limitations, - water tolerance, - competition with H2 evolution, - catalyst decomposition, - low long-term durability, - mechanistic elegance versus practical limitations. Keep this section balanced, factual, and chemically relevant. == Content of the Published Article in Detail == Write a clear, teaching-oriented explanation of the scientific content of the article. Include, where supported by the article: - the molecular components of the system, - how the photocatalytic experiment is set up, - what happens after light absorption by the photosensitizer, - whether reductive or oxidative quenching is proposed, - how the sacrificial electron donor participates, - how electrons are transferred to the catalyst, - what reduced catalyst states are proposed or observed, - how CO2 activation and reduction are described, - how CO is formed and released, - whether proton transfer is involved, - what side products are observed or suppressed, - what control experiments or spectroscopic/electrochemical studies support the mechanism. Mechanistic explanation rules: - Explain the mechanism in words. - Be chemically accurate. - Distinguish proposed intermediates from directly observed intermediates. - Use cautious wording where appropriate, such as "the article proposes" or "the data support". - Do not overstate mechanistic certainty. Possible supporting evidence may include: - Stern-Volmer quenching, - emission quenching, - transient absorption, - UV/Vis spectroscopy, - cyclic voltammetry, - spectroelectrochemistry, - control experiments omitting one component, - atmosphere controls, - product analysis, - catalyst comparison studies. == Catalyst == Describe the catalyst in a compact but chemically informative way. Include only details explicitly supported by the article, such as: - exact catalyst identity, - catalyst class, - metal center, - oxidation state if stated, - ligand family or coordination environment, - whether it is mononuclear, dinuclear, supramolecular, macrocyclic, polypyridyl, porphyrinic, or another named class, - whether it is molecular, immobilized, or heterogeneous, - catalytic role in CO2 reduction, - special redox or structural properties relevant to function, - selectivity-related features, - stability or decomposition issues relevant to performance. Do not invent structural details beyond what the article actually states or names. == Photosensitizer == Describe the photosensitizer in the same style. Include only details explicitly supported by the article, such as: - exact identity, - photosensitizer class, - light-harvesting role, - excited-state function, - whether it undergoes reductive or oxidative quenching, - relevant redox or photophysical properties if explicitly discussed, - why it is suitable in this system, - any stability or photobleaching issues if reported. If multiple photosensitizers are compared, identify the main one clearly and mention others only when relevant data are reported. == Investigation == Provide the core photocatalytic experiments as ONE fenced code block that starts with ```csv and ends with ```. The block must be plain CSV — no markdown table, no JSON, no text before or after it inside the block. The header row MUST be EXACTLY these columns, in this order: catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent C , solvent-ratio , additives , additives conc , feedstock gas , intensity , pH , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Quantum_yield__CO , Turnover_number__CH4 , Turnover_number__H2 , Turnover_frequency__H2 , Turnover_number__HCOOH , Turnover_frequency__HCOOH , Quantum_yield__HCOOH , H-D , H-D conc Extraction rules for the CSV: - One row per distinct experimental condition explicitly reported. Take the main photocatalytic performance table first, and add control / condition-variation rows when they are explicitly reported. Include EVERY distinct experiment — do not summarise or collapse rows. - Report numbers as bare values (no unit text) in exactly these units, converting only when the article gives a clear basis: cat conc = µM; PS conc = mM; e-D conc = M; H-D conc = M; Temperature = °C; λexc = nm; irr time = h; Turnover_frequency__* = h^-1; Quantum_yield__* = %. - catalyst, PS (photosensitizer), e-D (sacrificial electron donor), H-D (hydrogen/proton donor): use the identity (name or abbreviation) exactly as given in the article. Keep names consistent across rows. Never swap catalyst, photosensitizer, electron donor, hydrogen donor, solvent, or additive. - Turnover_number__X, Turnover_frequency__X, Quantum_yield__X are per product X (CO, CH4, H2, HCOOH). Put each product's value in its own column; never substitute CO yield, selectivity, total TON, or a value read from a graph. - For a solvent mixture, give solvent A/B/C and the ratio in solvent-ratio (for example 4:1). Keep additives out of the solvent fields. - Keep a wavelength range as a range (for example 420-650); a monochromatic source is a single nm value. - Leave a cell EMPTY only when the article does not state the value. Never invent, guess, reconstruct, or infer a value from general knowledge, figures, or discussion — every value must be explicitly supported by the article. - Do NOT use a value that appears only in the supporting information unless the main text also states it. - Never put a comma inside a cell (commas separate columns); use a space or a slash instead. - Do not add, remove, rename, or reorder columns. Before output, silently verify: section headings match exactly; no bibliographic metadata; units are as specified above; catalyst and photosensitizer are not swapped; no unsupported value was added; one row per distinct experiment. Return only the final MediaWiki entry with the CSV code block in the Investigation section. [OUTPUT SECTIONS - MANDATORY, emit ALL of them in this exact order, each as a wiki heading (== Name ==) followed by AT LEAST 30 words of substantive paper-specific content. Missing sections OR placeholder text like '' or '(...)' below a heading count as MISSING and INVALIDATE the output. Every heading MUST have real chemistry content underneath it] == Abstract Summary == == Advances and Special Progress == == Additional Remarks == == Content of the Published Article in Detail == == Catalyst == == Photosensitizer == == Investigation == The Investigation section must contain ONE fenced ```csv block with the header below as its first row. [OUTPUT FORMAT — INVESTIGATION CSV] Output the experiments as ONE fenced code block that starts with ```csv and ends with ```. The header row MUST be EXACTLY these columns, in this order: catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent-ratio , feedstock gas , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Turnover_number__H2 , Turnover_frequency__H2 , additives , Turnover_number__HCOOH , intensity , Turnover_number__CH4 , additives conc , Quantum_yield__CO , H-D , H-D conc , solvent C , Quantum_yield__HCOOH One row per distinct experiment; one value per cell; leave a cell empty only if the paper does not state it.' and documents [file-FaFrz7zc3JLdHPHsUscPHFfile-Tr7QPEKQjFQEi5UTak9pH8] 15:11:52 873805 AIClient - Response from AI: == Abstract Summary == This work describes a homogeneous molecular photocatalytic system for the visible-light reduction of CO2 to CO using iron(II) bis(pyrazolyl)phenanthroline complexes as catalysts. The system uses an iron catalyst, [Ru(bpy)3]2+ as photosensitizer, BIH as sacrificial electron donor, and mixed MeCN/H2O solvent under blue-light irradiation. All four iron complexes were active for CO formation. The best overall catalyst in the main comparison was Fe2, which reached a reported TONCO of 1318 with 84% CO selectivity under standard conditions. Under lower catalyst loading, Fe2 reached a much higher TONCO of 23,138 with CO selectivity up to 91%. Fe4 gave the highest CO selectivity in the catalyst series under the standard comparison, reaching 91%. The study also reports electrochemical, spectroscopic, and theoretical evidence supporting ligand-centered reduction and a homogeneous catalytic process. == Advances and Special Progress == A key advance is the introduction of a new iron(II) catalyst family based on bis(pyrazolyl)phenanthroline ligands for photocatalytic CO2-to-CO conversion. The article presents this ligand platform as previously underexplored for this reaction, while showing that it can support active and selective homogeneous photocatalysis under visible light. The study also shows strong catalytic performance at low catalyst loading. Fe2 reached a reported TONCO of 23,138 at 3.12 μM catalyst concentration, which the article identifies as among the higher values reported for Fe-based homogeneous photocatalysts. High CO selectivity was maintained across conditions, including up to 91% under low loading. Another reported advance is solvent compatibility with added water. The system operates in MeCN/H2O mixtures, and the article identifies 7.5-10% water as especially beneficial for catalytic activity and selectivity. Water is described as essential for effective proton-coupled electron transfer and stabilization of intermediates. The work also provides mechanistic insight. Electrochemical and DFT results support predominantly ligand-centered reduction rather than simple metal-centered reduction. Emission quenching experiments show that BIH quenches the excited photosensitizer much more efficiently than the Fe complexes. Mercury poisoning experiments and control reactions support a homogeneous catalytic system, while catalyst deactivation is attributed mainly to photosensitizer deterioration rather than immediate catalyst failure. == Additional Remarks == The chemistry is significant because photochemical CO2 reduction converts a thermodynamically stable molecule into CO, a useful carbon feedstock. The article emphasizes this as a route to value-added products under mild conditions, while also showing how ligand design can tune catalyst activity and selectivity. At the same time, this remains a sacrificial photochemical system. It depends on BIH as a sacrificial electron donor and on [Ru(bpy)3]2+ as a noble-metal photosensitizer. This means the system is chemically informative and mechanistically useful, but not fully earth-abundant as a complete light-harvesting platform. The reaction competes with H2 evolution, and product selectivity depends strongly on catalyst structure, water content, and catalyst loading. Water is beneficial only within a limited range. Too little water suppresses CO formation, while too much water lowers activity, which the article relates in part to poor BIH solubility in more aqueous media. Durability is mixed. The iron catalyst is described as robust and homogeneous, but the overall system still deactivates over time, mainly because the photosensitizer undergoes photodegradation. Thus, the work demonstrates strong molecular catalyst performance while also illustrating a common limitation of sacrificial photocatalytic CO2 reduction systems. == Content of the Published Article in Detail == The article studies four molecular iron(II) complexes, Fe1-Fe4, each containing a tetradentate bis(pyrazolyl)phenanthroline ligand and two coordinated water molecules in a distorted octahedral environment. The pyrazolyl substituents were varied to probe structure-activity relationships: H in Fe1, methyl in Fe2, phenyl in Fe3, and CF3 in Fe4. All complexes were characterized as high-spin Fe(II) species. The photocatalytic experiments used a borosilicate photoreactor containing catalyst, [Ru(bpy)3]2+ as photosensitizer, and BIH as sacrificial electron donor in a CO2-saturated MeCN/H2O solution. Irradiation was performed with blue light at 462 nm. Gas products in the headspace were analyzed by gas chromatography. CO and H2 were the detected gaseous products, while no significant formate or CH4 was detected. The article distinguishes clearly between observed data and mechanistic interpretation. UV-Vis spectroscopy and TD-DFT calculations show that the strong absorptions of the iron complexes in the ultraviolet region are mainly ligand-centered π-π* transitions. Weak bands near 450-480 nm are assigned to forbidden transitions. These data do not indicate that the iron complexes act as the primary light absorbers under the catalytic conditions; instead, [Ru(bpy)3]2+ serves as the light-harvesting photosensitizer. A mechanistic picture is proposed from energy-level analysis, fluorescence quenching, electrochemistry, and control experiments. After visible-light absorption, [Ru(bpy)3]2+ reaches its excited state. The article proposes that BIH is the dominant quencher of this excited photosensitizer through a reductive quenching pathway. This is supported by Stern-Volmer measurements showing a much larger quenching constant for BIH than for the Fe complexes. The reported quenching rate constant for BIH is near the diffusion-controlled limit, whereas the iron complexes quench less efficiently. The reduced photosensitizer is then proposed to transfer an electron to the iron complex. The article's DFT analysis indicates that the low-lying acceptor orbitals of Fe1-Fe4 are largely ligand-based. Cyclic voltammetry shows two reduction waves for the Fe catalysts, and the article interprets these as predominantly ligand-centered reductions rather than simple formal Fe(II)/Fe(I)/Fe(0) reductions. This interpretation is supported by the calculated frontier orbitals, which contain limited iron contribution in the relevant reduced states. Electrochemical studies under a restricted potential window show that the first one-electron-reduced species are relatively stable. Under CO2 atmosphere, the voltammograms differ from those under Ar, which the article interprets as evidence that reduced iron species react with CO2 to form catalytic intermediates not re-oxidized within the scanned window. The article therefore supports the idea that one-electron reduction of the catalyst is sufficient to activate it toward CO2 reduction under conditions accessible to the reduced photosensitizer. The article does not report direct spectroscopic observation of a bound CO2 adduct or a metal-carboxyl intermediate during catalysis. Instead, it proposes that proton-coupled electron transfer is important after reduction and CO2 binding. Water is described as essential in this role. In anhydrous MeCN, CO formation is almost completely suppressed. Upon adding 7.5-10% water, both activity and CO selectivity increase sharply. The article explains this by the need for a proton source and by hydrogen-bond stabilization of key intermediates involved in converting coordinated CO2 into CO-releasing species. CO formation is therefore described as proceeding through reduced iron-ligand states that react with CO2, followed by proton-coupled steps leading to CO release. H2 evolution is the main competing side reaction. The balance between CO formation and H2 production depends on ligand substitution, catalyst loading, and water content. Fe4, which contains electron-withdrawing CF3 groups, shows especially high CO selectivity, and the article notes weak intramolecular H···F interactions in the calculated structure that may assist proton management; this is presented cautiously as a possible contributor. Several control experiments support the photocatalytic assignment. Omitting light, catalyst, photosensitizer, BIH, or CO2 suppresses product formation. Using Fe(ClO4)2 instead of the defined molecular catalyst gives only minor activity. A mercury poisoning experiment gives essentially unchanged CO production, which supports a homogeneous rather than nanoparticle-mediated process. Long-term experiments show that activity levels off over time. UV-Vis monitoring of the reaction mixture and catalyst-replenishment tests support the interpretation that system deactivation arises mainly from photosensitizer degradation rather than rapid destruction of the Fe catalyst. == Catalyst == The catalysts are molecular homogeneous iron(II) complexes designated Fe1-Fe4. Each contains a bis(pyrazolyl)phenanthroline ligand framework and is formulated as [Fe(bpzRphen)(H2O)2]X2, where the pyrazolyl substituent R is varied across the series and X is BF4 or ClO4. These are mononuclear Fe(II) complexes with high-spin quintet ground states and distorted octahedral geometries according to magnetic measurements and DFT calculations. The tetradentate ligand binds through nitrogen donors, while two water ligands occupy axial positions. The catalysts function as the CO2-reduction components of the photocatalytic system rather than as the primary light absorbers. A notable feature is that the relevant reductions are described as mainly ligand-centered. This is important because it shapes how the reduced catalyst is generated and how it reacts with CO2. Fe2 gave the highest overall activity in the standard catalytic comparison, while Fe4 gave the highest CO selectivity. The catalysts are described as robust and homogeneous, with system deactivation attributed mainly to photosensitizer deterioration, although some catalyst decomposition under reaction conditions is not excluded. == Photosensitizer == The photosensitizer is [Ru(bpy)3]2+. It is a molecular ruthenium polypyridyl photosensitizer that serves as the visible-light absorber in the catalytic system. Irradiation was performed with blue light centered at 462 nm, matching the excitation of the Ru complex. Its excited state is involved in the photoredox cycle. The article's energy-level analysis and emission quenching experiments support reductive quenching of the excited photosensitizer by BIH as the dominant pathway. Oxidative quenching by the iron complexes is considered energetically feasible from orbital alignment, but experimentally BIH is shown to be the much more efficient quencher. The reduced photosensitizer is then proposed to transfer electrons to the Fe catalyst. The article also identifies photosensitizer deterioration as the main cause of catalytic deactivation over extended irradiation. UV-Vis measurements show hypochromism on prolonged irradiation, and adding fresh [Ru(bpy)3]2+ after 24 h restores CO production. == Investigation == ```csv catalyst , cat conc , PS , PS conc , e-D , e-D conc , solvent A , solvent B , solvent-ratio , feedstock gas , Temperature , λexc , irr time , Turnover_number__CO , Turnover_frequency__CO , Turnover_number__H2 , Turnover_frequency__H2 , additives , Turnover_number__HCOOH , intensity , Turnover_number__CH4 , additives conc , Quantum_yield__CO , H-D , H-D conc , solvent C , Quantum_yield__HCOOH Fe1 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 987 , 41.1 , 187 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 1318 , 54.9 , 243 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe3 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 847 , 35.3 , 205 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe4 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 1265 , 52.7 , 133 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 4 , 311 , 77.7 , 51 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 48 , 1578 , 32.9 , 296 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 96 , 1593 , 16.6 , 300 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 2 , not reported , 22 , not reported , not reported , not reported , not reported , not reported , 0 , not reported , H2O , 0 , not reported , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 1352 , 56.3 , 285 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 661 , 27.5 , 191 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 50 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 621 , 25.8 , 77 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 25 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 2086 , 86.9 , 123 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 12.5 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 4259 , 177.4 , 276 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 6.25 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 10168 , 423.7 , 862 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported Fe2 , 3.12 , [Ru(bpy)3]2+ , 0.3 , BIH , 0.11 , MeCN , H2O , not reported , CO2 , 35 , 462 , 24 , 23138 , 964.1 , 2177 , not reported , not reported , not reported , not reported , not reported , not reported , not reported , H2O , not reported , not reported , not reported ``` 15:11:54 873805 PublicationImportJob - created investigation page: Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO2-to-CO conversion under visible light - 2026.08.27-2/inv0 15:11:54 873805 PublicationImportJob - generated text from AI: Imported from: /opt/downloadPDF/chemwiki_pubstore/dd3ba84003829bc12df0acc251f953eb/Ferreira Jr. et al. - 2026 - Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO_6a9037604bf2e.pdf, /opt/downloadPDF/chemwiki_pubstore/dd3ba84003829bc12df0acc251f953eb/SI_6a9037604d3e3.pdf {{BaseTemplate}} {{DOI|doi=10.1016/j.jcat.2026.116673-2026.08.27-2}} == Abstract Summary == This work describes a homogeneous molecular photocatalytic system for the visible-light reduction of CO2 to CO using iron(II) bis(pyrazolyl)phenanthroline complexes as catalysts. The system uses an iron catalyst, [Ru(bpy)3]2+ as photosensitizer, BIH as sacrificial electron donor, and mixed MeCN/H2O solvent under blue-light irradiation. All four iron complexes were active for CO formation. The best overall catalyst in the main comparison was Fe2, which reached a reported TONCO of 1318 with 84% CO selectivity under standard conditions. Under lower catalyst loading, Fe2 reached a much higher TONCO of 23,138 with CO selectivity up to 91%. Fe4 gave the highest CO selectivity in the catalyst series under the standard comparison, reaching 91%. The study also reports electrochemical, spectroscopic, and theoretical evidence supporting ligand-centered reduction and a homogeneous catalytic process. == Advances and Special Progress == A key advance is the introduction of a new iron(II) catalyst family based on bis(pyrazolyl)phenanthroline ligands for photocatalytic CO2-to-CO conversion. The article presents this ligand platform as previously underexplored for this reaction, while showing that it can support active and selective homogeneous photocatalysis under visible light. The study also shows strong catalytic performance at low catalyst loading. Fe2 reached a reported TONCO of 23,138 at 3.12 μM catalyst concentration, which the article identifies as among the higher values reported for Fe-based homogeneous photocatalysts. High CO selectivity was maintained across conditions, including up to 91% under low loading. Another reported advance is solvent compatibility with added water. The system operates in MeCN/H2O mixtures, and the article identifies 7.5-10% water as especially beneficial for catalytic activity and selectivity. Water is described as essential for effective proton-coupled electron transfer and stabilization of intermediates. The work also provides mechanistic insight. Electrochemical and DFT results support predominantly ligand-centered reduction rather than simple metal-centered reduction. Emission quenching experiments show that BIH quenches the excited photosensitizer much more efficiently than the Fe complexes. Mercury poisoning experiments and control reactions support a homogeneous catalytic system, while catalyst deactivation is attributed mainly to photosensitizer deterioration rather than immediate catalyst failure. == Additional Remarks == The chemistry is significant because photochemical CO2 reduction converts a thermodynamically stable molecule into CO, a useful carbon feedstock. The article emphasizes this as a route to value-added products under mild conditions, while also showing how ligand design can tune catalyst activity and selectivity. At the same time, this remains a sacrificial photochemical system. It depends on BIH as a sacrificial electron donor and on [Ru(bpy)3]2+ as a noble-metal photosensitizer. This means the system is chemically informative and mechanistically useful, but not fully earth-abundant as a complete light-harvesting platform. The reaction competes with H2 evolution, and product selectivity depends strongly on catalyst structure, water content, and catalyst loading. Water is beneficial only within a limited range. Too little water suppresses CO formation, while too much water lowers activity, which the article relates in part to poor BIH solubility in more aqueous media. Durability is mixed. The iron catalyst is described as robust and homogeneous, but the overall system still deactivates over time, mainly because the photosensitizer undergoes photodegradation. Thus, the work demonstrates strong molecular catalyst performance while also illustrating a common limitation of sacrificial photocatalytic CO2 reduction systems. == Content of the Published Article in Detail == The article studies four molecular iron(II) complexes, Fe1-Fe4, each containing a tetradentate bis(pyrazolyl)phenanthroline ligand and two coordinated water molecules in a distorted octahedral environment. The pyrazolyl substituents were varied to probe structure-activity relationships: H in Fe1, methyl in Fe2, phenyl in Fe3, and CF3 in Fe4. All complexes were characterized as high-spin Fe(II) species. The photocatalytic experiments used a borosilicate photoreactor containing catalyst, [Ru(bpy)3]2+ as photosensitizer, and BIH as sacrificial electron donor in a CO2-saturated MeCN/H2O solution. Irradiation was performed with blue light at 462 nm. Gas products in the headspace were analyzed by gas chromatography. CO and H2 were the detected gaseous products, while no significant formate or CH4 was detected. The article distinguishes clearly between observed data and mechanistic interpretation. UV-Vis spectroscopy and TD-DFT calculations show that the strong absorptions of the iron complexes in the ultraviolet region are mainly ligand-centered π-π* transitions. Weak bands near 450-480 nm are assigned to forbidden transitions. These data do not indicate that the iron complexes act as the primary light absorbers under the catalytic conditions; instead, [Ru(bpy)3]2+ serves as the light-harvesting photosensitizer. A mechanistic picture is proposed from energy-level analysis, fluorescence quenching, electrochemistry, and control experiments. After visible-light absorption, [Ru(bpy)3]2+ reaches its excited state. The article proposes that BIH is the dominant quencher of this excited photosensitizer through a reductive quenching pathway. This is supported by Stern-Volmer measurements showing a much larger quenching constant for BIH than for the Fe complexes. The reported quenching rate constant for BIH is near the diffusion-controlled limit, whereas the iron complexes quench less efficiently. The reduced photosensitizer is then proposed to transfer an electron to the iron complex. The article's DFT analysis indicates that the low-lying acceptor orbitals of Fe1-Fe4 are largely ligand-based. Cyclic voltammetry shows two reduction waves for the Fe catalysts, and the article interprets these as predominantly ligand-centered reductions rather than simple formal Fe(II)/Fe(I)/Fe(0) reductions. This interpretation is supported by the calculated frontier orbitals, which contain limited iron contribution in the relevant reduced states. Electrochemical studies under a restricted potential window show that the first one-electron-reduced species are relatively stable. Under CO2 atmosphere, the voltammograms differ from those under Ar, which the article interprets as evidence that reduced iron species react with CO2 to form catalytic intermediates not re-oxidized within the scanned window. The article therefore supports the idea that one-electron reduction of the catalyst is sufficient to activate it toward CO2 reduction under conditions accessible to the reduced photosensitizer. The article does not report direct spectroscopic observation of a bound CO2 adduct or a metal-carboxyl intermediate during catalysis. Instead, it proposes that proton-coupled electron transfer is important after reduction and CO2 binding. Water is described as essential in this role. In anhydrous MeCN, CO formation is almost completely suppressed. Upon adding 7.5-10% water, both activity and CO selectivity increase sharply. The article explains this by the need for a proton source and by hydrogen-bond stabilization of key intermediates involved in converting coordinated CO2 into CO-releasing species. CO formation is therefore described as proceeding through reduced iron-ligand states that react with CO2, followed by proton-coupled steps leading to CO release. H2 evolution is the main competing side reaction. The balance between CO formation and H2 production depends on ligand substitution, catalyst loading, and water content. Fe4, which contains electron-withdrawing CF3 groups, shows especially high CO selectivity, and the article notes weak intramolecular H···F interactions in the calculated structure that may assist proton management; this is presented cautiously as a possible contributor. Several control experiments support the photocatalytic assignment. Omitting light, catalyst, photosensitizer, BIH, or CO2 suppresses product formation. Using Fe(ClO4)2 instead of the defined molecular catalyst gives only minor activity. A mercury poisoning experiment gives essentially unchanged CO production, which supports a homogeneous rather than nanoparticle-mediated process. Long-term experiments show that activity levels off over time. UV-Vis monitoring of the reaction mixture and catalyst-replenishment tests support the interpretation that system deactivation arises mainly from photosensitizer degradation rather than rapid destruction of the Fe catalyst. == Catalyst == The catalysts are molecular homogeneous iron(II) complexes designated Fe1-Fe4. Each contains a bis(pyrazolyl)phenanthroline ligand framework and is formulated as [Fe(bpzRphen)(H2O)2]X2, where the pyrazolyl substituent R is varied across the series and X is BF4 or ClO4. These are mononuclear Fe(II) complexes with high-spin quintet ground states and distorted octahedral geometries according to magnetic measurements and DFT calculations. The tetradentate ligand binds through nitrogen donors, while two water ligands occupy axial positions. The catalysts function as the CO2-reduction components of the photocatalytic system rather than as the primary light absorbers. A notable feature is that the relevant reductions are described as mainly ligand-centered. This is important because it shapes how the reduced catalyst is generated and how it reacts with CO2. Fe2 gave the highest overall activity in the standard catalytic comparison, while Fe4 gave the highest CO selectivity. The catalysts are described as robust and homogeneous, with system deactivation attributed mainly to photosensitizer deterioration, although some catalyst decomposition under reaction conditions is not excluded. == Photosensitizer == The photosensitizer is [Ru(bpy)3]2+. It is a molecular ruthenium polypyridyl photosensitizer that serves as the visible-light absorber in the catalytic system. Irradiation was performed with blue light centered at 462 nm, matching the excitation of the Ru complex. Its excited state is involved in the photoredox cycle. The article's energy-level analysis and emission quenching experiments support reductive quenching of the excited photosensitizer by BIH as the dominant pathway. Oxidative quenching by the iron complexes is considered energetically feasible from orbital alignment, but experimentally BIH is shown to be the much more efficient quencher. The reduced photosensitizer is then proposed to transfer electrons to the Fe catalyst. The article also identifies photosensitizer deterioration as the main cause of catalytic deactivation over extended irradiation. UV-Vis measurements show hypochromism on prolonged irradiation, and adding fresh [Ru(bpy)3]2+ after 24 h restores CO production. == Investigation == {{#experimentlist:|form=Photocatalytic_CO2_conversion_experiments|name=inv0}} [[Category:Photocatalytic CO2 conversion]] 15:11:58 873805 AIClient - File deleted from OpenAI repo: file-FaFrz7zc3JLdHPHsUscPHF 15:11:59 873805 AIClient - File deleted from OpenAI repo: file-Tr7QPEKQjFQEi5UTak9pH8 17:00:04 877438 AIClient - Request to AI with prompt: 'please check if the given text is spam. answer with yes or no.' and documents [Imported from: /opt/downloadPDF/chemwiki_pubstore/d716ca1fc4a4befe4e1b0f04b5e6ea30/Ferreira Jr. et al. - 2026 - Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO_6a900f1557b78.pdf, /opt/downloadPDF/chemwiki_pubstore/d716ca1fc4a4befe4e1b0f04b5e6ea30/SI_6a900f1559124.pdf DOI could not be found: 10.1016/j.jcat.2026.116673-2026.08.27 Contents 1 Abstract Summary 2 Advances and Special Progress 3 Additional Remarks 4 Content of the Published Article in Detail 5 Catalyst 6 Photosensitizer 7 Investigation Abstract Summary[edit | edit source] This study describes a homogeneous molecular photocatalytic system for the reduction of CO2 to CO under visible light using iron(II) bis(pyrazolyl)phenanthroline complexes as catalysts. The catalytic mixtures used a ruthenium polypyridyl photosensitizer, BIH as sacrificial electron donor, and mixed MeCN/H2O solvent under CO2 saturation. All four iron complexes were catalytically active for CO formation. The best overall catalyst under the standard comparison conditions was Fe2, which reached a reported TONCO of 1318 with 84% CO selectivity. Under lower catalyst loading, Fe2 reached much higher turnover numbers, up to 23,138 for CO, while maintaining high CO selectivity. The article also reports that water is essential for efficient catalysis, that the catalysis remains homogeneous according to mercury poisoning experiments, and that deactivation is mainly associated with deterioration of the photosensitizer rather than the iron catalyst. Advances and Special Progress[edit | edit source] A central advance is the introduction of a new family of iron(II) catalysts based on bis(pyrazolyl)phenanthroline ligands for visible-light-driven CO2-to-CO conversion. The article presents this ligand framework as an underexplored alternative to more established iron systems based on quaterpyridine, quinquepyridine, salophen, and related ligand sets. The work also shows that systematic ligand modification changes catalytic behavior. Neutral, electron-donating, sterically bulky, and electron-withdrawing pyrazolyl substituents were compared within a common scaffold, allowing direct structure-activity analysis. Among the tested complexes, Fe2 gave the highest activity, whereas Fe4 gave the highest CO selectivity in the series. Another important advance is the combination of high activity with mixed-solvent water compatibility. The article explicitly shows that 7.5-10% water is beneficial and in practice essential for efficient CO2 reduction, because anhydrous conditions give almost no CO. This is chemically significant because water both supports proton-coupled electron transfer and stabilizes intermediates according to the mechanistic interpretation presented. The article also emphasizes durability-related insight. Control experiments, repeated irradiation studies, UV-Vis monitoring, and replenishment of the photosensitizer support the conclusion that catalyst deactivation is not mainly due to iron catalyst collapse but instead is largely linked to photosensitizer degradation. Mercury poisoning experiments further support a homogeneous catalytic regime rather than nanoparticle-mediated catalysis. Finally, the study provides mechanistic progress by combining cyclic voltammetry, DFT, TD-DFT, and Stern-Volmer quenching analysis. The data support ligand-centered reductions on the iron complexes, identify the excited-state quenching behavior of the photosensitizer, and support a catalytic pathway in which one-electron-reduced iron species are competent for CO2 activation. Additional Remarks[edit | edit source] The chemistry is relevant because CO is a useful reduced carbon product and an industrial feedstock. Photochemical CO2-to-CO conversion is also a useful model reaction for studying multi-electron and proton-coupled small-molecule activation under mild conditions. At the same time, the system remains a sacrificial photochemical platform rather than a fully sustainable closed cycle. The reaction requires BIH as sacrificial electron donor and [Ru(bpy)3]2+ as photosensitizer. The article therefore demonstrates efficient catalytic chemistry, but it does not remove reliance on a noble-metal photosensitizer or sacrificial reagent. The solvent system is also important to interpret correctly. The highest activity in the standard experiments occurs in mixed MeCN/H2O rather than in dry acetonitrile. However, too much water decreases activity. The article attributes this decrease partly to the poor solubility of BIH at high water content, which limits effective quenching of the excited photosensitizer. Competition between CO formation and H2 evolution is present throughout the study. The catalysts are selective for CO under the reported conditions, but H2 remains a measurable side product. No significant CH4 or formate production was detected in the experiments described. A further practical limitation is long-term photostability. The catalytic activity rises quickly at early irradiation times and then approaches a plateau. The article links this behavior mainly to photosensitizer photodegradation, supported by hypochromism in UV-Vis spectra and by recovery of activity after photosensitizer replenishment. Content of the Published Article in Detail[edit | edit source] The molecular photocatalytic system contains four closely related iron(II) complexes, designated Fe1-Fe4, each bearing a tetradentate bis(pyrazolyl)phenanthroline ligand and two coordinated water molecules. The catalysts are molecular, homogeneous iron complexes in distorted octahedral coordination environments. The standard photocatalytic mixture also contains [Ru(bpy)3]2+ as photosensitizer and BIH as sacrificial electron donor in CO2-saturated MeCN/H2O. The photocatalytic experiments were carried out in a borosilicate photoreactor containing 4.0 mL of solution, irradiated with blue light centered at 462 nm. Under the standard catalyst comparison conditions, the mixture contained 50 μM iron catalyst, 0.3 mM [Ru(bpy)3]2+, and 0.11 M BIH in CO2-saturated MeCN/H2O. Product analysis of the gas phase was performed by gas chromatography. CO and H2 were observed. The article states that no significant formate or CH4 was detected. The photophysical analysis shows that the strong UV absorption bands of the iron complexes are mainly ligand-centered π-π* transitions. Weak lower-energy absorptions near 450-480 nm were assigned to forbidden transitions. The article explicitly states that these data do not indicate intrinsic photosensitizing ability of the iron complexes under the catalytic conditions. Instead, light absorption is carried by the ruthenium photosensitizer. Mechanistically, the article combines DFT and Stern-Volmer analysis to discuss excited-state electron transfer. The HOMO of BIH is calculated above that of [Ru(bpy)3]2+, which supports reductive quenching of the excited ruthenium photosensitizer by BIH. Stern-Volmer measurements also show that BIH quenches the emission of [Ru(bpy)3]2+ more efficiently than the iron complexes do. The article therefore identifies BIH as the dominant quencher of the excited photosensitizer. The iron complexes can also quench the excited state of [Ru(bpy)3]2+, but less efficiently. The energy-level discussion in the article indicates that oxidative quenching of the excited photosensitizer by the iron complexes is energetically feasible, whereas reductive quenching by the iron complexes is not favored. Even so, the article cautions that quenching efficiency alone should not be equated directly with catalytic efficiency. Electrochemical studies are central to the mechanistic interpretation. All four iron complexes show two reduction waves in acetonitrile. The article considers whether these are metal-centered or ligand-centered reductions and concludes, based on DFT orbital analysis and electrochemical trends, that the reductions are predominantly ligand-centered. The lowest semi-unoccupied orbitals have limited iron character and are mainly distributed over the ligand framework. Additional cyclic voltammetry under a restricted potential window showed that the first one-electron reduction is accessible within the reducing power available from the photosensitizer system. Under CO2, the voltammetric responses differ from those under Ar, and the article interprets this as evidence that the one-electron-reduced iron species react with CO2 to form intermediates that are not simply re-oxidized on the return scan. Thus, the data support the proposal that singly reduced iron complexes are catalytically relevant states for CO2 activation. The article does not directly observe all catalytic intermediates, but it proposes a chemically consistent pathway. After photoexcitation of [Ru(bpy)3]2+, BIH reductively quenches the excited state. The reduced photosensitizer can then transfer an electron to the iron complex, generating reduced catalyst states. The electrochemical and computational data support these as ligand-centered reduced species rather than formal low-valent iron states. CO2 activation is proposed to occur at the reduced iron complex. The article specifically discusses the importance of proton-coupled electron transfer and the stabilizing role of water. It states that water can stabilize metal-CO2 intermediates through hydrogen bonding and also act as a proton donor. In the mechanistic discussion, Fe-CO2 adducts and Fe-COOH-type intermediates are invoked conceptually, but these are proposed intermediates rather than directly isolated species. The role of water is strongly supported experimentally. In anhydrous MeCN, the system produced very little CO. Addition of 7.5% water caused a large increase in both CO production and selectivity, and 10% water gave similarly strong performance. Higher water fractions decreased activity. The article interprets this as a balance between beneficial proton delivery and intermediate stabilization on one hand, and unfavorable BIH solubility and quenching behavior on the other. Several control experiments support the overall catalytic assignment. In the absence of light, catalyst, photosensitizer, sacrificial donor, or CO2, no significant catalytic CO production occurred. Use of Fe(ClO4)2 instead of the molecular iron complex gave only minor CO and H2 formation, showing that free Fe2+ is not responsible for the reported activity. Under Ar instead of CO2, CO production was not significant. The homogeneous nature of the catalysis was examined by mercury poisoning. The addition of a large excess of mercury did not suppress the observed CO production under the tested conditions, which the article takes as evidence against catalysis by iron nanoparticles or colloidal metallic species. The authors therefore assign the active system as homogeneous. Catalyst robustness was examined by time-course experiments and photosensitizer replenishment. Catalytic activity increased strongly at early times and then plateaued. UV-Vis monitoring of the reaction mixture showed hypochromism attributed to photosensitizer deterioration. When additional [Ru(bpy)3]2+ was added after 24 h, CO production resumed, supporting the conclusion that photosensitizer degradation is the main source of deactivation, while the iron catalyst remains comparatively robust under the reported conditions. Catalyst[edit | edit source] The catalysts are a series of molecular iron(II) bis(pyrazolyl)phenanthroline complexes, labeled Fe1, Fe2, Fe3, and Fe4. They are homogeneous mononuclear iron complexes containing tetradentate bis(pyrazolyl)phenanthroline ligands and two coordinated water ligands, formulated as [Fe(bpzRphen)(H2O)2]X2 with different pyrazolyl substituents. All four complexes were reported to have high-spin quintet ground states and distorted octahedral geometries. Magnetic susceptibility measurements supported high-spin Fe(II), and DFT calculations agreed with a quintet ground state for the series. The coordinated ligand framework controls the redox behavior, and the article concludes that the accessible reductions are predominantly ligand-centered. The four ligand variants were designed to compare different substituent effects: unsubstituted pyrazolyl, dimethyl-substituted pyrazolyl, diphenyl-substituted pyrazolyl, and trifluoromethyl-substituted pyrazolyl. These modifications changed both activity and selectivity. Fe2, the dimethyl-substituted complex, gave the highest overall activity under the standard comparison conditions and also the highest reported TONCO at low catalyst loading. Fe4, the trifluoromethyl-substituted complex, gave the highest CO selectivity in the standard series comparison. The article further notes a structural feature for Fe4: weak intramolecular hydrogen-bonding interactions between coordinated water ligands and fluorine atoms of the CF3 substituents. The authors suggest that such contacts may help proton management around the metal center and may contribute to the enhanced CO selectivity of Fe4. This is presented as an interpretation based on calculated structure rather than direct proof of the catalytic origin of selectivity. The catalysts are described as robust under the reported photocatalytic conditions, but not perfectly immutable. The study indicates that deactivation mainly arises from photosensitizer deterioration rather than dominant catalyst decomposition. Mercury poisoning tests support a homogeneous molecular catalytic regime rather than conversion into heterogeneous iron particles. Photosensitizer[edit | edit source] The photosensitizer is [Ru(bpy)3]2+. It serves as the visible-light absorber and initiates the photoredox sequence required for electron delivery to the iron catalyst. The experiments used this ruthenium complex at 0.3 mM in the photocatalytic mixtures. The article discusses the excited state as the metal-to-ligand charge-transfer triplet state of the ruthenium complex. Stern-Volmer emission quenching experiments show that BIH efficiently quenches this excited state, with a quenching rate constant on the order of 1010 M−1 s−1. This supports a dominant reductive quenching pathway by BIH. The iron catalysts also quench the excited state of [Ru(bpy)3]2+, but much less efficiently than BIH. The article therefore treats BIH as the main quencher in the working catalytic system. DFT-based energy-level alignment is used to rationalize the relative feasibility of reductive and oxidative quenching pathways. A key limitation of the photosensitizer in this system is durability. UV-Vis monitoring during irradiation showed loss of the characteristic ruthenium absorption, interpreted as photosensitizer degradation. Additional support comes from the restoration of CO production after replenishment of [Ru(bpy)3]2+. Thus, the photosensitizer is chemically suitable for visible-light activation but is also identified as the main weak point in long-duration catalysis. Investigation[edit | edit source] cat cat conc [µM] PS PS conc [mM] e-D e-D conc [M] . . solvent A . . . . . . λexc [nm] . TON CO . . TON CH4 TON H2 . TON HCOOH . . . . 1. Fe1 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 987 not reported 187 not reported "not reported" is not a number. 2. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 1318 not reported 243 not reported "not reported" is not a number. 3. Fe3 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 847 not reported 205 not reported "not reported" is not a number. 4. Fe4 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 1265 not reported 133 not reported "not reported" is not a number. 5. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 311 not reported 51 not reported "not reported" is not a number. 6. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 1578 not reported 296 not reported "not reported" is not a number. 7. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 1593 not reported 300 not reported "not reported" is not a number. 8. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 2 not reported 22 not reported "not reported" is not a number. 9. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 1352 not reported 285 not reported "not reported" is not a number. 10. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 661 not reported 191 not reported "not reported" is not a number. 11. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 621 not reported 77 not reported "not reported" is not a number. 12. Fe2 25 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 2086 not reported 123 not reported "not reported" is not a number. 13. Fe2 12.5 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 4259 not reported 276 not reported "not reported" is not a number. 14. Fe2 6.25 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 10168 not reported 862 not reported "not reported" is not a number. 15. Fe2 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 23138 not reported 2177 not reported "not reported" is not a number. 16. Fe1 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 not reported not reported not reported not reported "not reported" is not a number. 17. Fe2 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 not reported not reported not reported not reported "not reported" is not a number. 18. Fe3 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 not reported not reported not reported not reported "not reported" is not a number. 19. Fe4 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN 462 not reported not reported not reported not reported "not reported" is not a number. Investigation-Name: inv0ExportRefresh] 17:00:08 877438 AIClient - Response from AI: No 17:00:12 877438 AIClient - Request to AI with prompt: 'please check if the given text is spam. answer with yes or no.' and documents [Imported from: /opt/downloadPDF/chemwiki_pubstore/dd3ba84003829bc12df0acc251f953eb/Ferreira Jr. et al. - 2026 - Iron(II) bis(pyrazolyl)phenanthroline complexes as robust and efficient homogeneous catalysts for CO_6a9037604bf2e.pdf, /opt/downloadPDF/chemwiki_pubstore/dd3ba84003829bc12df0acc251f953eb/SI_6a9037604d3e3.pdf DOI could not be found: 10.1016/j.jcat.2026.116673-2026.08.27-2 Contents 1 Abstract Summary 2 Advances and Special Progress 3 Additional Remarks 4 Content of the Published Article in Detail 5 Catalyst 6 Photosensitizer 7 Investigation Abstract Summary[edit | edit source] This work describes a homogeneous molecular photocatalytic system for the visible-light reduction of CO2 to CO using iron(II) bis(pyrazolyl)phenanthroline complexes as catalysts. The system uses an iron catalyst, [Ru(bpy)3]2+ as photosensitizer, BIH as sacrificial electron donor, and mixed MeCN/H2O solvent under blue-light irradiation. All four iron complexes were active for CO formation. The best overall catalyst in the main comparison was Fe2, which reached a reported TONCO of 1318 with 84% CO selectivity under standard conditions. Under lower catalyst loading, Fe2 reached a much higher TONCO of 23,138 with CO selectivity up to 91%. Fe4 gave the highest CO selectivity in the catalyst series under the standard comparison, reaching 91%. The study also reports electrochemical, spectroscopic, and theoretical evidence supporting ligand-centered reduction and a homogeneous catalytic process. Advances and Special Progress[edit | edit source] A key advance is the introduction of a new iron(II) catalyst family based on bis(pyrazolyl)phenanthroline ligands for photocatalytic CO2-to-CO conversion. The article presents this ligand platform as previously underexplored for this reaction, while showing that it can support active and selective homogeneous photocatalysis under visible light. The study also shows strong catalytic performance at low catalyst loading. Fe2 reached a reported TONCO of 23,138 at 3.12 μM catalyst concentration, which the article identifies as among the higher values reported for Fe-based homogeneous photocatalysts. High CO selectivity was maintained across conditions, including up to 91% under low loading. Another reported advance is solvent compatibility with added water. The system operates in MeCN/H2O mixtures, and the article identifies 7.5-10% water as especially beneficial for catalytic activity and selectivity. Water is described as essential for effective proton-coupled electron transfer and stabilization of intermediates. The work also provides mechanistic insight. Electrochemical and DFT results support predominantly ligand-centered reduction rather than simple metal-centered reduction. Emission quenching experiments show that BIH quenches the excited photosensitizer much more efficiently than the Fe complexes. Mercury poisoning experiments and control reactions support a homogeneous catalytic system, while catalyst deactivation is attributed mainly to photosensitizer deterioration rather than immediate catalyst failure. Additional Remarks[edit | edit source] The chemistry is significant because photochemical CO2 reduction converts a thermodynamically stable molecule into CO, a useful carbon feedstock. The article emphasizes this as a route to value-added products under mild conditions, while also showing how ligand design can tune catalyst activity and selectivity. At the same time, this remains a sacrificial photochemical system. It depends on BIH as a sacrificial electron donor and on [Ru(bpy)3]2+ as a noble-metal photosensitizer. This means the system is chemically informative and mechanistically useful, but not fully earth-abundant as a complete light-harvesting platform. The reaction competes with H2 evolution, and product selectivity depends strongly on catalyst structure, water content, and catalyst loading. Water is beneficial only within a limited range. Too little water suppresses CO formation, while too much water lowers activity, which the article relates in part to poor BIH solubility in more aqueous media. Durability is mixed. The iron catalyst is described as robust and homogeneous, but the overall system still deactivates over time, mainly because the photosensitizer undergoes photodegradation. Thus, the work demonstrates strong molecular catalyst performance while also illustrating a common limitation of sacrificial photocatalytic CO2 reduction systems. Content of the Published Article in Detail[edit | edit source] The article studies four molecular iron(II) complexes, Fe1-Fe4, each containing a tetradentate bis(pyrazolyl)phenanthroline ligand and two coordinated water molecules in a distorted octahedral environment. The pyrazolyl substituents were varied to probe structure-activity relationships: H in Fe1, methyl in Fe2, phenyl in Fe3, and CF3 in Fe4. All complexes were characterized as high-spin Fe(II) species. The photocatalytic experiments used a borosilicate photoreactor containing catalyst, [Ru(bpy)3]2+ as photosensitizer, and BIH as sacrificial electron donor in a CO2-saturated MeCN/H2O solution. Irradiation was performed with blue light at 462 nm. Gas products in the headspace were analyzed by gas chromatography. CO and H2 were the detected gaseous products, while no significant formate or CH4 was detected. The article distinguishes clearly between observed data and mechanistic interpretation. UV-Vis spectroscopy and TD-DFT calculations show that the strong absorptions of the iron complexes in the ultraviolet region are mainly ligand-centered π-π* transitions. Weak bands near 450-480 nm are assigned to forbidden transitions. These data do not indicate that the iron complexes act as the primary light absorbers under the catalytic conditions; instead, [Ru(bpy)3]2+ serves as the light-harvesting photosensitizer. A mechanistic picture is proposed from energy-level analysis, fluorescence quenching, electrochemistry, and control experiments. After visible-light absorption, [Ru(bpy)3]2+ reaches its excited state. The article proposes that BIH is the dominant quencher of this excited photosensitizer through a reductive quenching pathway. This is supported by Stern-Volmer measurements showing a much larger quenching constant for BIH than for the Fe complexes. The reported quenching rate constant for BIH is near the diffusion-controlled limit, whereas the iron complexes quench less efficiently. The reduced photosensitizer is then proposed to transfer an electron to the iron complex. The article's DFT analysis indicates that the low-lying acceptor orbitals of Fe1-Fe4 are largely ligand-based. Cyclic voltammetry shows two reduction waves for the Fe catalysts, and the article interprets these as predominantly ligand-centered reductions rather than simple formal Fe(II)/Fe(I)/Fe(0) reductions. This interpretation is supported by the calculated frontier orbitals, which contain limited iron contribution in the relevant reduced states. Electrochemical studies under a restricted potential window show that the first one-electron-reduced species are relatively stable. Under CO2 atmosphere, the voltammograms differ from those under Ar, which the article interprets as evidence that reduced iron species react with CO2 to form catalytic intermediates not re-oxidized within the scanned window. The article therefore supports the idea that one-electron reduction of the catalyst is sufficient to activate it toward CO2 reduction under conditions accessible to the reduced photosensitizer. The article does not report direct spectroscopic observation of a bound CO2 adduct or a metal-carboxyl intermediate during catalysis. Instead, it proposes that proton-coupled electron transfer is important after reduction and CO2 binding. Water is described as essential in this role. In anhydrous MeCN, CO formation is almost completely suppressed. Upon adding 7.5-10% water, both activity and CO selectivity increase sharply. The article explains this by the need for a proton source and by hydrogen-bond stabilization of key intermediates involved in converting coordinated CO2 into CO-releasing species. CO formation is therefore described as proceeding through reduced iron-ligand states that react with CO2, followed by proton-coupled steps leading to CO release. H2 evolution is the main competing side reaction. The balance between CO formation and H2 production depends on ligand substitution, catalyst loading, and water content. Fe4, which contains electron-withdrawing CF3 groups, shows especially high CO selectivity, and the article notes weak intramolecular H···F interactions in the calculated structure that may assist proton management; this is presented cautiously as a possible contributor. Several control experiments support the photocatalytic assignment. Omitting light, catalyst, photosensitizer, BIH, or CO2 suppresses product formation. Using Fe(ClO4)2 instead of the defined molecular catalyst gives only minor activity. A mercury poisoning experiment gives essentially unchanged CO production, which supports a homogeneous rather than nanoparticle-mediated process. Long-term experiments show that activity levels off over time. UV-Vis monitoring of the reaction mixture and catalyst-replenishment tests support the interpretation that system deactivation arises mainly from photosensitizer degradation rather than rapid destruction of the Fe catalyst. Catalyst[edit | edit source] The catalysts are molecular homogeneous iron(II) complexes designated Fe1-Fe4. Each contains a bis(pyrazolyl)phenanthroline ligand framework and is formulated as [Fe(bpzRphen)(H2O)2]X2, where the pyrazolyl substituent R is varied across the series and X is BF4 or ClO4. These are mononuclear Fe(II) complexes with high-spin quintet ground states and distorted octahedral geometries according to magnetic measurements and DFT calculations. The tetradentate ligand binds through nitrogen donors, while two water ligands occupy axial positions. The catalysts function as the CO2-reduction components of the photocatalytic system rather than as the primary light absorbers. A notable feature is that the relevant reductions are described as mainly ligand-centered. This is important because it shapes how the reduced catalyst is generated and how it reacts with CO2. Fe2 gave the highest overall activity in the standard catalytic comparison, while Fe4 gave the highest CO selectivity. The catalysts are described as robust and homogeneous, with system deactivation attributed mainly to photosensitizer deterioration, although some catalyst decomposition under reaction conditions is not excluded. Photosensitizer[edit | edit source] The photosensitizer is [Ru(bpy)3]2+. It is a molecular ruthenium polypyridyl photosensitizer that serves as the visible-light absorber in the catalytic system. Irradiation was performed with blue light centered at 462 nm, matching the excitation of the Ru complex. Its excited state is involved in the photoredox cycle. The article's energy-level analysis and emission quenching experiments support reductive quenching of the excited photosensitizer by BIH as the dominant pathway. Oxidative quenching by the iron complexes is considered energetically feasible from orbital alignment, but experimentally BIH is shown to be the much more efficient quencher. The reduced photosensitizer is then proposed to transfer electrons to the Fe catalyst. The article also identifies photosensitizer deterioration as the main cause of catalytic deactivation over extended irradiation. UV-Vis measurements show hypochromism on prolonged irradiation, and adding fresh [Ru(bpy)3]2+ after 24 h restores CO production. Investigation[edit | edit source] cat cat conc [µM] PS PS conc [mM] e-D e-D conc [M] . . solvent A . . . additives . . . . λexc [nm] . TON CO . . TON CH4 TON H2 . TON HCOOH . . 1. Fe1 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 987 not reported 187 not reported "not reported" is not a number. 2. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 1318 not reported 243 not reported "not reported" is not a number. 3. Fe3 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 847 not reported 205 not reported "not reported" is not a number. 4. Fe4 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 1265 not reported 133 not reported "not reported" is not a number. 5. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 311 not reported 51 not reported "not reported" is not a number. 6. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 1578 not reported 296 not reported "not reported" is not a number. 7. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 1593 not reported 300 not reported "not reported" is not a number. 8. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 2 not reported 22 not reported "not reported" is not a number. 9. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 1352 not reported 285 not reported "not reported" is not a number. 10. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 661 not reported 191 not reported "not reported" is not a number. 11. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 621 not reported 77 not reported "not reported" is not a number. 12. Fe2 25 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 2086 not reported 123 not reported "not reported" is not a number. 13. Fe2 12.5 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 4259 not reported 276 not reported "not reported" is not a number. 14. Fe2 6.25 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 10168 not reported 862 not reported "not reported" is not a number. 15. Fe2 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported 462 23138 not reported 2177 not reported "not reported" is not a number. Investigation-Name: inv0ExportRefresh] 17:00:13 877438 AIClient - Response from AI: No 17:00:13 877438 AIClient - Request to AI with prompt: 'please check if the given text is spam. answer with yes or no.' and documents [Penggunaan internet semakin memudahkan masyarakat dalam mencari informasi tentang berbagai platform dan layanan digital. Salah satu keyword yang dapat ditemukan dalam pencarian berbahasa Indonesia adalah jepang88. Istilah ini dapat muncul pada artikel, blog, forum, dan berbagai halaman yang membahas topik terkait platform online. Banyaknya halaman yang menggunakan keyword serupa membuat pembaca perlu lebih teliti. Tidak semua website mempunyai sumber, tujuan, atau tingkat kredibilitas yang sama. Karena itu, memahami cara mengevaluasi sebuah halaman dapat membantu pengguna mendapatkan informasi yang lebih baik. Mengenal Jepang88 Jepang88 merupakan keyword yang digunakan dalam berbagai pencarian internet. Bergantung pada konteksnya, istilah tersebut dapat muncul sebagai topik pembahasan, nama platform, maupun bagian dari konten promosi. Pembaca sebaiknya memahami konteks halaman sebelum mengambil kesimpulan. Nama keyword saja tidak cukup untuk memastikan bahwa sebuah website merupakan sumber resmi atau terpercaya. Memeriksa Alamat Domain Salah satu langkah dasar saat menemukan halaman jepang88 adalah memeriksa URL dengan teliti. Perhatikan ejaan domain, susunan karakter, dan ekstensi yang digunakan. Beberapa situs dapat menggunakan alamat yang mirip dengan keyword populer sehingga terlihat familiar. Perbedaan kecil pada URL dapat menunjukkan bahwa pengguna sedang mengakses sumber yang berbeda. Karena itu, pemeriksaan domain sebaiknya dilakukan sebelum memberikan informasi apa pun. Memahami Keamanan Website Pengguna juga dapat melihat apakah sebuah halaman memakai HTTPS. Teknologi tersebut membantu mengenkripsi komunikasi antara browser dan server. Namun, HTTPS bukan jaminan bahwa sebuah situs sepenuhnya terpercaya. Pengguna tetap perlu memeriksa reputasi domain, informasi pengelola, kebijakan privasi, dan kualitas konten sebelum melanjutkan aktivitas di dalam website. Menilai Isi Artikel Ketika membaca artikel mengenai jepang88, perhatikan apakah informasi yang diberikan mempunyai struktur yang jelas dan sesuai dengan topik. Konten yang baik biasanya menjelaskan suatu istilah dengan bahasa yang mudah dipahami tanpa memberikan klaim yang berlebihan. Pembaca juga dapat membandingkan informasi dengan sumber lain. Jika sebuah pernyataan hanya muncul pada satu halaman tanpa penjelasan yang memadai, sebaiknya lakukan pemeriksaan tambahan sebelum menganggapnya sebagai fakta. Waspadai Materi Promosi Dalam pencarian jepang88, pengguna mungkin menemukan konten yang memuat berbagai klaim tentang bonus, keuntungan, hadiah, atau fitur tertentu. Sebagian informasi tersebut dapat dibuat untuk tujuan pemasaran. Penting untuk membedakan informasi faktual dengan bahasa promosi. Sebuah klaim mengenai hasil atau keuntungan tidak otomatis menjadi jaminan. Syarat dan ketentuan perlu dibaca secara teliti sebelum mempercayai sebuah penawaran. Menjaga Data Pribadi Keamanan data merupakan bagian penting ketika mengunjungi platform online. Jangan memasukkan kata sandi, kode OTP, informasi kartu pembayaran, atau dokumen identitas pada halaman yang belum dapat dipercaya. Apabila sebuah situs jepang88 meminta data sensitif secara berlebihan, sebaiknya hentikan proses dan lakukan pemeriksaan lebih lanjut. Kode verifikasi juga tidak boleh diberikan kepada pihak lain melalui pesan pribadi atau formulir yang tidak jelas. Menggunakan kata sandi kuat dan berbeda untuk akun penting dapat membantu meningkatkan perlindungan terhadap akses yang tidak sah. Hati-Hati dengan Tautan Tambahan Situs online dapat berisi tautan yang mengarah ke halaman lain. Pengguna sebaiknya memeriksa alamat tujuan sebelum membuka tautan, terutama apabila URL terlihat tidak berhubungan dengan halaman utama. Hindari mengunduh aplikasi atau file dari sumber yang tidak dapat diverifikasi. Browser dan sistem operasi juga sebaiknya diperbarui secara berkala agar fitur keamanan terbaru dapat digunakan. Memahami Risiko Jika Berkaitan dengan Perjudian Apabila jepang88 muncul dalam konteks perjudian, pengguna perlu memahami bahwa aktivitas tersebut memiliki risiko finansial. Permainan yang bergantung pada keberuntungan tidak dapat menjamin kemenangan atau keuntungan tertentu. Ketentuan mengenai perjudian berbeda-beda berdasarkan negara dan wilayah. Batas usia juga harus diperhatikan, dan orang yang belum mencapai usia legal tidak boleh berpartisipasi dalam aktivitas perjudian. Mempelajari keyword jepang88 untuk memahami informasi internet dapat dilakukan tanpa harus mengikuti aktivitas perjudian. Pentingnya Membandingkan Sumber Satu artikel tidak selalu memberikan gambaran lengkap mengenai jepang88. Membandingkan beberapa sumber dapat membantu pembaca menemukan informasi yang lebih konsisten dan memahami konteks dengan lebih baik. Perhatikan juga tanggal publikasi karena informasi mengenai platform online dapat berubah. Artikel lama mungkin tidak lagi mencerminkan kondisi terbaru. Sumber yang transparan dan diperbarui secara berkala biasanya lebih berguna untuk memperoleh informasi yang relevan. Tips Browsing yang Lebih Aman Pengguna dapat membiasakan diri memeriksa URL sebelum mengklik, membaca isi halaman secara menyeluruh, dan menghindari pemberian data sensitif kepada situs yang tidak dikenal. Selain itu, jangan mudah percaya pada klaim yang menawarkan hasil pasti atau keuntungan cepat. Membandingkan informasi dan menggunakan sumber yang jelas dapat membantu mengurangi risiko ketika menjelajah internet. Kesimpulan Jepang88 merupakan keyword yang dapat ditemukan dalam berbagai pencarian dan konten digital berbahasa Indonesia. Karena istilah tersebut dapat digunakan oleh banyak halaman dengan tujuan berbeda, pengguna perlu melakukan evaluasi sebelum mempercayai sebuah sumber. Memeriksa domain, memperhatikan keamanan website, membaca konten secara kritis, menjaga data pribadi, serta membandingkan beberapa sumber merupakan langkah penting dalam aktivitas online. Jika pembahasannya berkaitan dengan perjudian, risiko finansial, ketentuan usia, dan peraturan hukum setempat juga harus selalu diperhatikan.] 17:00:15 877438 AIClient - Response from AI: Yes 17:00:15 877438 AIClient - Request to AI with prompt: 'please check if the given text is spam. answer with yes or no.' and documents [M encari ruang rekreasi virtual yang ideal di tengah lautan situs digital saat ini sering kali menuntut ketelitian tersendiri agar waktu luang yang dihabiskan benar-benar memberikan keseruan sekaligus ketenangan pikiran yang dicari. Setiap orang tentu mendambakan sebuah ekosistem maya yang menyajikan variasi permainan berkualitas tinggi yang dipadukan dengan stabilitas sistem serta kemudahan navigasi tanpa hambatan yang melelahkan. Di sinilah peran rekomendasi dari para penggiat hobi digital menjadi sangat esensial untuk memandu siapa saja menemukan tempat pelarian yang paling tepat tanpa harus mencoba satu per satu situs yang ada di internet. Ketika Anda mulai menyimak berbagai ulasan positif yang dibagikan secara terbuka oleh para pencinta hiburan interaktif, platform PAKDE4D sering kali disebut sebagai salah satu rekomendasi utama yang patut dipertimbangkan berkat konsistensinya dalam menghadirkan pengalaman layanan unggulan yang dirancang khusus untuk memuaskan para penggunanya secara maksimal setiap hari. Contents 1 Pergeseran Gaya Hidup Modern Menuju Hiburan Praktis 2 Menjaga Kepercayaan Melalui Proteksi Keamanan Tingkat Tinggi 3 Menikmati Kekayaan Fitur dan Ragam Permainan Inovatif 4 Menumbuhkan Kesadaran Berperilaku Bijak dalam Menikmati Hobi 5 Menyongsong Masa Depan Ekosistem Hiburan Virtual Kreatif Pergeseran Gaya Hidup Modern Menuju Hiburan Praktis[edit | edit source] Transformasi pola hidup masyarakat kontemporer yang bergerak dengan tempo serba cepat telah melahirkan kebutuhan baru akan sarana rekreasi yang fleksibel, praktis, dan dapat diakses kapan saja langsung dari perangkat telepon pintar di dalam genggaman. Gawai pintar yang dulunya sekadar alat komunikasi kini bertransformasi menjadi portal hiburan tanpa batas yang mampu menyajikan berbagai bentuk permainan kreatif untuk melepas penat setelah seharian bergelut dengan rutinitas harian yang padat. Perubahan perilaku konsumen ini menuntut para pengelola situs web untuk terus berinovasi dalam menyajikan antarmuka yang bersih, responsif, dan sangat ramah pengguna agar siapa pun dapat beradaptasi dengan cepat sejak detik pertama membuka halaman situs tersebut. Kecepatan muat sistem serta kestabilan koneksi jaringan menjadi fondasi utama yang memastikan setiap pemain dapat menikmati detik demi detik petualangan virtual dengan rasa nyaman yang konsisten tanpa gangguan yang meresahkan. Menjaga Kepercayaan Melalui Proteksi Keamanan Tingkat Tinggi[edit | edit source] Faktor kepercayaan memegang peranan paling krusial dalam menentukan kualitas sebuah platform digital di tengah iklim persaingan industri kreatif yang kian kompetitif dari waktu ke waktu bagi seluruh lapisan masyarakat. Setiap pengunjung tentu menaruh perhatian besar pada jaminan perlindungan data pribadi serta kejelasan sistem operasional yang transparan agar mereka dapat merasa tenang tanpa dibayangi rasa khawatir akan adanya risiko kecurangan. Penerapan teknologi enkripsi tingkat lanjut serta kebijakan privasi yang ketat mencerminkan bentuk profesionalisme pengelola dalam menciptakan lingkungan bermain yang adil dan menjunjung tinggi sportivitas bagi seluruh anggotanya tanpa terkecuali. Ketika rasa aman sudah terbangun secara kokoh di dalam sistem, para pengguna dapat lebih fokus menikmati jalannya permainan dengan pikiran yang jernih dan merasakan kepuasan batin secara utuh dari setiap aktivitas rekreasi yang mereka lakukan sehari-hari. Menikmati Kekayaan Fitur dan Ragam Permainan Inovatif[edit | edit source] Daya tarik utama yang membuat sebuah wadah rekreasi virtual tidak mudah terasa membosankan terletak pada pilihan permainan yang bervariasi serta inovasi fitur yang selalu diperbarui secara berkala oleh pihak pengembang yang berpengalaman. Mulai dari konsep permainan konvensional yang sarat akan unsur nostalgia hingga deretan game modern dengan balutan grafis memukau serta tata suara yang imersif, semuanya dirancang untuk memanjakan pancaindra para penikmatnya secara optimal. Selain itu, kehadiran layanan bantuan pelanggan yang responsif selama dua puluh jam penuh memberikan ketenteraman tersendiri karena setiap kendala kecil di dalam sistem dapat segera teratasi dengan ramah dan solutif. Kombinasi antara kelengkapan fitur permainan dan dukungan teknis yang prima inilah yang menjadikan pengalaman beraktivitas di ruang digital terasa jauh lebih hidup dan berwarna setiap harinya. Menumbuhkan Kesadaran Berperilaku Bijak dalam Menikmati Hobi[edit | edit source] Menjadikan aktivitas permainan interaktif sebagai sarana pelepas penat memang merupakan pilihan yang sah bagi siapa saja, namun kedisiplinan dalam mengelola waktu dan emosi tetap menjadi kunci utama agar dampaknya senantiasa positif bagi kehidupan. Pengaturan durasi harian yang terukur serta penetapan batas anggaran rekreasi yang realistis akan menghindarkan seseorang dari potensi kejenuhan mental maupun tekanan finansial yang tidak diinginkan di masa mendatang dalam hidup mereka. Keseimbangan hidup yang terjaga dengan baik memastikan bahwa hobi ini tetap berfungsi sebagaimana mestinya, yakni sebagai media hiburan yang menyegarkan pikiran tanpa mengorbankan prioritas utama dalam kehidupan nyata seperti pekerjaan, pendidikan, dan keluarga tercinta di rumah. Menyongsong Masa Depan Ekosistem Hiburan Virtual Kreatif[edit | edit source] Perkembangan teknologi global yang didorong oleh kemajuan kecerdasan buatan serta perluasan infrastruktur jaringan telekomunikasi dipastikan akan terus membawa dunia hiburan digital menuju babak baru yang jauh lebih canggih dan mengagumkan di tahun-tahun mendatang. Para pengelola platform dituntut untuk senantiasa memiliki visi ke depan yang adaptif agar mampu menjawab ekspektasi generasi pengguna baru yang kian kritis terhadap kualitas layanan digital yang mereka konsumsi sehari-hari. Pada akhirnya, kecermatan dalam menyaring informasi, kebijaksanaan dalam mengelola diri, serta pemilihan destinasi rekreasi yang kredibel akan selalu menjadi fondasi terpenting bagi siapa saja yang ingin menikmati era digital secara aman, produktif, dan membahagiakan.] 17:00:17 877438 AIClient - Response from AI: Yes 17:00:17 877438 AIClient - Request to AI with prompt: 'please check if the given text is spam. answer with yes or no.' and documents [Accessing an online entertainment account from a new smartphone, tablet, or computer can be convenient, but it also requires careful attention to security. A new device may not have the same privacy settings, browser protections, or security controls as a familiar device. Before entering login information, users should take a few simple precautions to protect their accounts and personal information. For anyone preparing to use Ufabet login access on a new device, the most important approach is to verify the website, secure the device, confirm account details, and understand the available recovery options. Taking these steps can reduce common login problems and improve account security. Confirm That the Device Is Secure Before opening a login page, users should check whether the new device is trustworthy. Personal smartphones and computers are generally preferable to unknown or shared devices because users have greater control over their security settings. The operating system should be updated, and the browser should use a current version. Security updates often address vulnerabilities that could otherwise expose personal information. Users should also check that the device is protected by a screen lock, password, PIN, or biometric security. These basic protections can prevent other people from accessing saved information if the device is lost or left unattended. Verify the Official Website One of the most important checks involves the website itself. Users should confirm that they are accessing the legitimate Ufabet website before entering a username, password, telephone number, or other sensitive information. A professional-looking page is not sufficient proof of authenticity. Fake websites can copy familiar logos and layouts to make them appear genuine. Users should carefully inspect the domain address and avoid suspicious links received through unsolicited messages or social media. Bookmarking a verified website can also help users avoid accidentally visiting imitation login pages in the future. Check the Browser Address The browser's address bar provides an important security signal. Before entering credentials, users should carefully review the complete website address. Look for unexpected spelling changes, unfamiliar domains, or unusual additions to the address. If something appears different from the ทางเข้าufabet เข้าสู่ระบบ website normally used, do not enter login information until the address has been independently verified. Users should also pay attention to browser security warnings. If the browser reports that a website connection is unsafe or suspicious, it is better to stop rather than continue to the login form. Avoid Public or Shared Devices A new device does not necessarily mean a public device is safe. Computers in internet cafés, libraries, workplaces, hotels, or other shared environments may contain saved passwords, browser extensions, or software that users cannot control. Whenever possible, users should access their accounts through a personally controlled device. If a shared computer must be used, avoid saving login credentials and make sure to log out completely afterward. Clearing browsing information may provide additional protection, but it should not be considered a substitute for using a trusted device. Review Password Security Before logging in on a new device, users should make sure they know their correct password. More importantly, they should confirm that the password is unique and has not been reused on other websites. If the same password is used across multiple services, a security problem on another website could potentially affect the account. A unique password reduces this risk. Users should never send passwords to other people through messaging applications or social media. Legitimate support personnel should not require users to disclose their private password. Check Available Two-Step Security If additional account security features are available, users should consider enabling them. Two-step authentication can provide another layer of protection beyond the password. Depending on the service, additional verification may involve a code sent to a registered phone number, email address, or an approved authentication method. Before changing security settings on a new device, users should make sure that their recovery information is current. Losing access to a registered phone number or email address can make account recovery more difficult. Confirm Recovery Information A new device is a good opportunity to review account recovery information. Users should check whether the registered email address and telephone number are still active and accessible. Accurate recovery information can be important if the password is forgotten or suspicious activity is detected. If an account requires a recovery code, users should store it securely and never publish it online. Recovery information should be treated with the same care as other sensitive account details. Be Careful With Saved Passwords Modern browsers and smartphones can automatically save login information. This feature can be convenient, but users should consider whether the device is private and protected. On a personal device with strong screen security, password management tools can make it easier to use unique credentials. On a shared computer, however, saving a password can allow another person to access the account. Users should only enable automatic login when they understand the security implications. Check for Suspicious Apps or Extensions Before using a new device, review installed applications and browser extensions. Unknown software can create unnecessary security risks. Users should download applications only from reputable sources and remove extensions they do not recognize or need. If a browser behaves unusually, redirects unexpectedly, or displays suspicious warnings, users should investigate before entering account credentials. Keeping the device's security software updated can provide additional protection. Understand Login Notifications Some online services may notify users when an account is accessed from a new device or location. Such notifications can help users identify activity they do not recognize. If a user receives an unexpected login alert, they should not ignore it. Instead, they should review account activity through the official website and change the password if necessary. Users should also be cautious with security notifications received through email or messaging services. Rather than clicking links inside unexpected messages, they should access the official website directly. Check Account and Transaction Activity After successfully accessing an account on a new device, users should review account information and recent activity when those features are available. Look for unfamiliar changes, login sessions, or transactions. If something appears incorrect, contact the platform's official support channel. This habit is particularly useful when moving to a new phone or computer because it provides an opportunity to confirm that the account remains under the user's control. Remember Responsible Online Entertainment If the account provides betting or gambling services, users should also consider financial responsibility when accessing it from a new device. Convenience can make it easier to spend more time or money than originally intended. Set clear personal limits and avoid using money required for essential expenses. Gambling outcomes are uncertain, and no login method or platform feature can guarantee profits. A secure account should also be a responsibly managed account. Final Thoughts Using Ufabet login access on a new device does not have to be complicated. The key is to prepare before entering credentials. Users should secure the device, verify the website address, avoid public computers, review password and recovery information, and check available security features. After logging in, reviewing account activity and responding appropriately to unusual notifications can provide additional protection. Users should also remain cautious about suspicious links, applications, and requests for private credentials. A few minutes of preparation can make the transition to a new device much safer and more organized. By combining secure technology habits with responsible account management, users can reduce avoidable problems while accessing their online entertainment account.] 17:00:18 877438 AIClient - Response from AI: Yes 17:00:19 877438 AIClient - Request to AI with prompt: 'please check if the given text is spam. answer with yes or no.' and documents [cat cat conc [µM] PS PS conc [mM] e-D e-D conc [M] H-D H-D conc [M] solvent A solvent B solvent C solv A/B/C additives additives conc [M] feedstock gas feedstock volume [mL] intensity [kW/m²] pH T [°C] λexc [nm] t [h] TON CO TOF CO [TOF/min] Φ CO [%] TON CH4 TOF CH4 [TOF/min] Φ CH4 [%] TON H2 TOF H2 [TOF/min] Φ H2 [%] TON HCOOH TOF HCOOH [TOF/min] Φ HCOOH [%] TON MeOH TOF MeOH [TOF/min] Φ MeOH [%] selectivity [%] [CO;CH4;H2;HCOOH;MeOH] Φ all [%] Details include Fe1 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 987 41.1 not reported not reported 187 not reported not reported not reported not reported 84.1%; 0%; 15.9%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 1318 54.9 not reported not reported 243 not reported not reported not reported not reported 84.4%; 0%; 15.6%; 0%; 0% "not reported" is not a number. Fe3 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 847 35.3 not reported not reported 205 not reported not reported not reported not reported 80.5%; 0%; 19.5%; 0%; 0% "not reported" is not a number. Fe4 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 1265 52.7 not reported not reported 133 not reported not reported not reported not reported 90.5%; 0%; 9.5%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 4 311 77.7 not reported not reported 51 not reported not reported not reported not reported 85.9%; 0%; 14.1%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 48 1578 32.9 not reported not reported 296 not reported not reported not reported not reported 84.2%; 0%; 15.8%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 96 1593 16.6 not reported not reported 300 not reported not reported not reported not reported 84.2%; 0%; 15.8%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 MeCN not reported CO2 not reported not reported 35 462 24 2 not reported not reported not reported 22 not reported not reported not reported not reported 8.3%; 0%; 91.7%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 1352 56.3 not reported not reported 285 not reported not reported not reported not reported 82.6%; 0%; 17.4%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 661 27.5 not reported not reported 191 not reported not reported not reported not reported 77.6%; 0%; 22.4%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 621 25.8 not reported not reported 77 not reported not reported not reported not reported 89.0%; 0%; 11.0%; 0%; 0% "not reported" is not a number. Fe2 25 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 2086 86.9 not reported not reported 123 not reported not reported not reported not reported 94.4%; 0%; 5.6%; 0%; 0% "not reported" is not a number. Fe2 12.5 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 4259 177.4 not reported not reported 276 not reported not reported not reported not reported 93.9%; 0%; 6.1%; 0%; 0% "not reported" is not a number. Fe2 6.25 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 10168 423.7 not reported not reported 862 not reported not reported not reported not reported 92.2%; 0%; 7.8%; 0%; 0% "not reported" is not a number. Fe2 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 24 23138 964.1 not reported not reported 2177 not reported not reported not reported not reported 91.4%; 0%; 8.6%; 0%; 0% "not reported" is not a number. Fe1 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 4 not reported not reported 4.70 not reported not reported not reported not reported not reported not reported n/a 4.7 "not reported" is not a number. Fe2 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 4 not reported not reported 7.58 not reported not reported not reported not reported not reported not reported n/a 7.58 "not reported" is not a number. Fe3 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 4 not reported not reported 3.76 not reported not reported not reported not reported not reported not reported n/a 3.76 "not reported" is not a number. Fe4 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported CO2 not reported not reported 35 462 4 not reported not reported 7.25 not reported not reported not reported not reported not reported not reported n/a 7.25 "not reported" is not a number.] 17:00:20 877438 AIClient - Response from AI: No 17:00:20 877438 AIClient - Request to AI with prompt: 'please check if the given text is spam. answer with yes or no.' and documents [cat cat conc [µM] PS PS conc [mM] e-D e-D conc [M] H-D H-D conc [M] solvent A solvent B solvent C solv A/B/C additives additives conc [M] feedstock gas feedstock volume [mL] intensity [kW/m²] pH T [°C] λexc [nm] t [h] TON CO TOF CO [TOF/min] Φ CO [%] TON CH4 TOF CH4 [TOF/min] Φ CH4 [%] TON H2 TOF H2 [TOF/min] Φ H2 [%] TON HCOOH TOF HCOOH [TOF/min] Φ HCOOH [%] TON MeOH TOF MeOH [TOF/min] Φ MeOH [%] selectivity [%] [CO;CH4;H2;HCOOH;MeOH] Φ all [%] Details include Fe1 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 987 41.1 not reported not reported 187 not reported not reported not reported 84.1%; 0%; 15.9%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 1318 54.9 not reported not reported 243 not reported not reported not reported 84.4%; 0%; 15.6%; 0%; 0% "not reported" is not a number. Fe3 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 847 35.3 not reported not reported 205 not reported not reported not reported 80.5%; 0%; 19.5%; 0%; 0% "not reported" is not a number. Fe4 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 1265 52.7 not reported not reported 133 not reported not reported not reported 90.5%; 0%; 9.5%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 4 311 77.7 not reported not reported 51 not reported not reported not reported 85.9%; 0%; 14.1%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 48 1578 32.9 not reported not reported 296 not reported not reported not reported 84.2%; 0%; 15.8%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 96 1593 16.6 not reported not reported 300 not reported not reported not reported 84.2%; 0%; 15.8%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O 0 MeCN H2O not reported not reported not reported 0 CO2 not reported 35 462 24 2 not reported not reported not reported 22 not reported not reported not reported 8.3%; 0%; 91.7%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 1352 56.3 not reported not reported 285 not reported not reported not reported 82.6%; 0%; 17.4%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 661 27.5 not reported not reported 191 not reported not reported not reported 77.6%; 0%; 22.4%; 0%; 0% "not reported" is not a number. Fe2 50 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 621 25.8 not reported not reported 77 not reported not reported not reported 89.0%; 0%; 11.0%; 0%; 0% "not reported" is not a number. Fe2 25 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 2086 86.9 not reported not reported 123 not reported not reported not reported 94.4%; 0%; 5.6%; 0%; 0% "not reported" is not a number. Fe2 12.5 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 4259 177.4 not reported not reported 276 not reported not reported not reported 93.9%; 0%; 6.1%; 0%; 0% "not reported" is not a number. Fe2 6.25 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 10168 423.7 not reported not reported 862 not reported not reported not reported 92.2%; 0%; 7.8%; 0%; 0% "not reported" is not a number. Fe2 3.12 ［Ru(bpy)3］2+ 0.3 BIH 0.11 H2O not reported MeCN H2O not reported not reported not reported not reported CO2 not reported 35 462 24 23138 964.1 not reported not reported 2177 not reported not reported not reported 91.4%; 0%; 8.6%; 0%; 0% "not reported" is not a number.] 17:00:21 877438 AIClient - Response from AI: no