Photochemical Reduction of Carbon Dioxide to Formic Acid using Ruthenium(II)-Based Catalysts and Visible Light: Difference between revisions

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DOI 10.1002/cctc.201500494
Authors Alonso Rosas-Hernández, Henrik Junge, Matthias Beller,
Submitted 26.08.2015
Published online 26.08.2015
Licenses http://doi.wiley.com/10.1002/tdm_license_1.1,
Subjects Inorganic Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, Catalysis
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{{BaseTemplate}}
{{BaseTemplate}}
[[Category:Photocatalytic CO2 conversion to HCOOH]]
[[Category:Photocatalytic CO2 conversion to HCOOH]]
{{#doiinfobox: 10.1002/cctc.201500494 }}{{MissingInvestigation}}{{FaultyMolecule}}
{{DOI|doi=10.1002/cctc.201500494 }}
 
=== Abstract ===
=== Abstract ===


==== Summary ====
==== Summary ====
A photochemical reduction of CO<sub>2</sub> to formic acid was shown using a system containing an iridium-based photosensitizer, ruthenium photocatalyst and triethanolamine as the electron donor. Turnover numbers up to 526 and a selectivity of 80% towards formic acid were observed if the reaction was performed with [Ir(ppy)<sub>2</sub>(bpy)]PF<sub>6</sub> ({{#moleculelink:|link=RJJGJTKSOSSNNL-UHFFFAOYSA-N|image=false|width=300|height=200}}) as the photosensitizer and [Ru(bpy)<sub>2</sub>(Cl)(CO)]PF<sub>6</sub> as the catalyst.  The experiments were conducted under irradiation with Hg-lamp equipped with a ''λ''=400–700 nm filter.
A photochemical reduction of CO<sub>2</sub> to formic acid was shown using a system containing an iridium-based photosensitizer, ruthenium photocatalyst and triethanolamine as the electron donor. Turnover numbers up to 526 and a selectivity of 80% towards formic acid were observed if the reaction was performed with [Ir(ppy)<sub>2</sub>(bpy)]PF<sub>6</sub> ({{#moleculelink:|link=RJJGJTKSOSSNNL-UHFFFAOYSA-N|image=false|width=300|height=200}}) as the photosensitizer and [Ru(bpy)<sub>2</sub>(Cl)(CO)]PF<sub>6</sub> ({{#moleculelink: |link=WUXWMOMXGWJDBM-UHFFFAOYSA-M|image=false|width=300|height=200}}) as the catalyst.  The experiments were conducted under irradiation with Hg-lamp equipped with a ''λ''=400–700 nm filter.


==== Advances and special progress ====
==== Advances and special progress ====
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=== Content of the published article in detail ===
=== Content of the published article in detail ===
The article contains results for the reduction of CO2 to formic under visible-light catalysis using ruthenium complexes as catalysts, the iridium complex [Ir(ppy)<sub>2</sub>(bpy)]PF<sub>6</sub> ({{#moleculelink:|link=RJJGJTKSOSSNNL-UHFFFAOYSA-N|image=false|width=300|height=200}}) as a photosensitizer and triethanolamine as the electron donor. The catalytic system performs best (referring to the TON of HCOOH production) with [Ru(bpy)<sub>2</sub>(Cl)(CO)]PF<sub>6</sub> as photocatalyst.
The article contains results for the reduction of CO2 to formic under visible-light catalysis using ruthenium complexes as catalysts, the iridium complex [Ir(ppy)<sub>2</sub>(bpy)]PF<sub>6</sub> ({{#moleculelink:|link=RJJGJTKSOSSNNL-UHFFFAOYSA-N|image=false|width=300|height=200}}) as a photosensitizer and triethanolamine as the electron donor. The catalytic system performs best (referring to the TON of HCOOH production) with [Ru(bpy)<sub>2</sub>(Cl)(CO)]PF<sub>6</sub> ({{#moleculelink: |link=WUXWMOMXGWJDBM-UHFFFAOYSA-M|image=false|width=300|height=200}}) as photocatalyst.


==== Catalysts ====
==== Catalysts ====
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Line 165: Line 164:
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M  V30 END ATOM
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M  V30 END BOND
M  V30 END BOND
M  V30 END CTAB
M  V30 END CTAB
M  END
M  END
</chemform><chemform smiles="C1C=CN2[Ru+2]([*])([*])3(N4C=CC=CC=4C4C=CC=CN=43)N3=CC=CC=C3C=2C=1.F[P-](F)(F)(F)(F)F.F[P-](F)(F)(F)(F)F" inchikey="MVHJANUNBKMKDC-UHFFFAOYSA-N" inchi="1S/2C10H8N2.2C3H6O.2F6P.Ru/c2*1-3-7-11-9(5-1)10-6-2-4-8-12-10;2*1-3(2)4;2*1-7(2,3,4,5)6;/h2*1-8H;2*1-2H3;;;/q;;;;2*-1;+2" float="none" width="200" height="200" r1="H2O,CO(CH3)2" r2="CO,CO(CH3)2">
</chemform><chemform smiles="C1C=CN2[Ru+2](O=C(C)C)(O=C(C)C)3(N4C=CC=CC=4C4C=CC=CN=43)N3=CC=CC=C3C=2C=1.F[P-](F)(F)(F)(F)F.F[P-](F)(F)(F)(F)F" inchi="1S/2C10H8N2.2C3H6O.2F6P.Ru/c2*1-3-7-11-9(5-1)10-6-2-4-8-12-10;2*1-3(2)4;2*1-7(2,3,4,5)6;/h2*1-8H;2*1-2H3;;;/q;;;;2*-1;+2" inchikey="MVHJANUNBKMKDC-UHFFFAOYSA-N" height="200px" width="300px" float="none">
   -INDIGO-01092415502D
   -INDIGO-02262411282D


   0  0  0  0  0  0  0  0  0  0  0 V3000
   0  0  0  0  0  0  0  0  0  0  0 V3000
M  V30 BEGIN CTAB
M  V30 BEGIN CTAB
M  V30 COUNTS 41 44 0 0 0
M  V30 COUNTS 47 50 0 0 0
M  V30 BEGIN ATOM
M  V30 BEGIN ATOM
M  V30 1 F 12.767 -3.05 0.0 0
M  V30 1 F 12.1174 -3.75053 0.0 0
M  V30 2 P 13.633 -2.55 0.0 0 CHG=-1
M  V30 2 P 12.9691 -3.25877 0.0 0 CHG=-1
M  V30 3 F 14.499 -3.05 0.0 0
M  V30 3 F 13.8209 -3.75053 0.0 0
M  V30 4 F 13.633 -1.55 0.0 0
M  V30 4 F 12.9691 -2.27524 0.0 0
M  V30 5 F 12.767 -2.05 0.0 0
M  V30 5 F 12.1174 -2.76701 0.0 0
M  V30 6 F 14.499 -2.05 0.0 0
M  V30 6 F 13.8209 -2.76701 0.0 0
M  V30 7 F 13.633 -3.55 0.0 0
M  V30 7 F 12.9691 -4.2423 0.0 0
M  V30 8 F 13.109 -6.375 0.0 0
M  V30 8 F 12.0523 -6.85 0.0 0
M  V30 9 P 13.975 -5.875 0.0 0 CHG=-1
M  V30 9 P 12.9182 -6.35 0.0 0 CHG=-1
M  V30 10 F 14.841 -6.375 0.0 0
M  V30 10 F 13.7843 -6.85 0.0 0
M  V30 11 F 13.975 -4.875 0.0 0
M  V30 11 F 12.9182 -5.34999 0.0 0
M  V30 12 F 13.109 -5.375 0.0 0
M  V30 12 F 12.0523 -5.85 0.0 0
M  V30 13 F 14.841 -5.375 0.0 0
M  V30 13 F 13.7843 -5.85 0.0 0
M  V30 14 F 13.975 -6.875 0.0 0
M  V30 14 F 12.9182 -7.35001 0.0 0
M  V30 15 C 4.00985 -3.42507 0.0 0
M  V30 15 C 4.96571 -3.48512 0.0 0
M  V30 16 C 5.74015 -3.42459 0.0 0
M  V30 16 C 6.43719 -3.48472 0.0 0
M  V30 17 C 4.87664 -2.92497 0.0 0
M  V30 17 C 5.70285 -3.05983 0.0 0
M  V30 18 N 5.74015 -4.42553 0.0 0
M  V30 18 N 6.43719 -4.33594 0.0 0
M  V30 19 C 4.00985 -4.43002 0.0 0
M  V30 19 C 4.96571 -4.33976 0.0 0
M  V30 20 C 4.87882 -4.92503 0.0 0
M  V30 20 C 5.7047 -4.76073 0.0 0
M  V30 21 C 6.60641 -2.92499 0.0 0
M  V30 21 C 7.17388 -3.05985 0.0 0
M  V30 22 C 7.47083 -1.42609 0.0 0
M  V30 22 C 7.90901 -1.78515 0.0 0
M  V30 23 C 6.60649 -1.92428 0.0 0
M  V30 23 C 7.17395 -2.20882 0.0 0
M  V30 24 C 8.33778 -1.92638 0.0 0
M  V30 24 C 8.64632 -2.2106 0.0 0
M  V30 25 N 7.47682 -3.42729 0.0 0
M  V30 25 N 7.9141 -3.48701 0.0 0
M  V30 26 C 8.3399 -2.92207 0.0 0
M  V30 26 C 8.64809 -3.05737 0.0 0
M  V30 27 C 3.98485 -6.37507 0.0 0
M  V30 27 C 4.98697 -6.01514 0.0 0
M  V30 28 N 5.71515 -6.37459 0.0 0
M  V30 28 N 6.45845 -6.01473 0.0 0
M  V30 29 C 4.85164 -5.87497 0.0 0
M  V30 29 C 5.7241 -5.58984 0.0 0
M  V30 30 C 5.71515 -7.37553 0.0 0
M  V30 30 C 6.45845 -6.86595 0.0 0
M  V30 31 C 3.98485 -7.38002 0.0 0
M  V30 31 C 4.98697 -6.86977 0.0 0
M  V30 32 C 4.85382 -7.87503 0.0 0
M  V30 32 C 5.72596 -7.29074 0.0 0
M  V30 33 C 6.58166 -7.8747 0.0 0
M  V30 33 C 7.19535 -7.29046 0.0 0
M  V30 34 C 8.31196 -7.87139 0.0 0
M  V30 34 C 8.66688 -7.28764 0.0 0
M  V30 35 N 7.44763 -7.37318 0.0 0
M  V30 35 N 7.93179 -6.86395 0.0 0
M  V30 36 C 8.31359 -8.87233 0.0 0
M  V30 36 C 8.66826 -8.13887 0.0 0
M  V30 37 C 6.5833 -8.87964 0.0 0
M  V30 37 C 7.19675 -8.14508 0.0 0
M  V30 38 C 7.45308 -9.37324 0.0 0
M  V30 38 C 7.93643 -8.56485 0.0 0
M  V30 39 R# 8.87596 -6.15 0.0 0 RGROUPS=(1 2)
M  V30 39 Ru 7.90744 -5.10948 0.0 0 CHG=2
M  V30 40 Ru 7.45618 -5.32553 0.0 0 CHG=2
M  V30 40 O 9.27558 -4.15054 0.0 0
M  V30 41 R# 8.88398 -4.525 0.0 0 RGROUPS=(1 1)
M  V30 41 O 9.32346 -5.80948 0.0 0
M  V30 42 C 10.1416 -3.65054 0.0 0
M  V30 43 C 10.1416 -2.65054 0.0 0
M  V30 44 C 11.0076 -4.15054 0.0 0
M  V30 45 C 10.1895 -6.30948 0.0 0
M  V30 46 C 11.0555 -5.80948 0.0 0
M  V30 47 C 10.1895 -7.30948 0.0 0
M  V30 END ATOM
M  V30 END ATOM
M  V30 BEGIN BOND
M  V30 BEGIN BOND
Line 337: Line 447:
M  V30 37 2 37 38
M  V30 37 2 37 38
M  V30 38 1 38 36
M  V30 38 1 38 36
M  V30 39 10 18 40
M  V30 39 10 25 39
M  V30 40 10 40 25
M  V30 40 10 39 35
M  V30 41 10 40 28
M  V30 41 10 39 28
M  V30 42 10 40 35
M  V30 42 10 39 18
M  V30 43 10 40 39
M  V30 43 10 39 40
M  V30 44 10 40 41
M  V30 44 10 39 41
M  V30 45 2 40 42
M  V30 46 1 42 43
M  V30 47 1 42 44
M  V30 48 2 41 45
M  V30 49 1 45 46
M  V30 50 1 45 47
M  V30 END BOND
M  V30 END CTAB
M  END
</chemform><chemform smiles="C1C=CN2[Ru+2]([C-]#[O+])([H-])3(N4C=CC=CC=4C4C=CC=CN=43)N3=CC=CC=C3C=2C=1.F[P-](F)(F)(F)(F)F" inchi="1S/2C10H8N2.CO.F6P.Ru.H/c2*1-3-7-11-9(5-1)10-6-2-4-8-12-10;1-2;1-7(2,3,4,5)6;;/h2*1-8H;;;;/q;;;-1;+2;-1" inchikey="HJTHNVDYVJWKQG-UHFFFAOYSA-N" height="200px" width="300px" float="none">
  -INDIGO-02262411182D
 
  0  0  0  0  0  0  0  0  0  0  0 V3000
M  V30 BEGIN CTAB
M  V30 COUNTS 35 39 0 0 0
M  V30 BEGIN ATOM
M  V30 1 C 4.57242 -3.91012 0.0 0
M  V30 2 C 6.0439 -3.90972 0.0 0
M  V30 3 C 5.30956 -3.48483 0.0 0
M  V30 4 N 6.0439 -4.76094 0.0 0
M  V30 5 C 4.57242 -4.76476 0.0 0
M  V30 6 C 5.31141 -5.18573 0.0 0
M  V30 7 C 6.78059 -3.48485 0.0 0
M  V30 8 C 7.51572 -2.21015 0.0 0
M  V30 9 C 6.78066 -2.63382 0.0 0
M  V30 10 C 8.25303 -2.6356 0.0 0
M  V30 11 N 7.52081 -3.91201 0.0 0
M  V30 12 C 8.2548 -3.48237 0.0 0
M  V30 13 C 4.59368 -6.44014 0.0 0
M  V30 14 N 6.06516 -6.43973 0.0 0
M  V30 15 C 5.33081 -6.01484 0.0 0
M  V30 16 C 6.06516 -7.29095 0.0 0
M  V30 17 C 4.59368 -7.29477 0.0 0
M  V30 18 C 5.33267 -7.71574 0.0 0
M  V30 19 C 6.80206 -7.71546 0.0 0
M  V30 20 C 8.27359 -7.71264 0.0 0
M  V30 21 N 7.5385 -7.28895 0.0 0
M  V30 22 C 8.27497 -8.56387 0.0 0
M  V30 23 C 6.80346 -8.57008 0.0 0
M  V30 24 C 7.54314 -8.98985 0.0 0
M  V30 25 Ru 7.51415 -5.53448 0.0 0 CHG=2
M  V30 26 H 8.88229 -4.57554 0.0 0 CHG=-1
M  V30 27 C 8.93149 -6.24753 0.0 0 CHG=-1
M  V30 28 O 9.78318 -6.7393 0.0 0 CHG=1
M  V30 29 F 10.5241 -4.07553 0.0 0
M  V30 30 P 11.3758 -3.58377 0.0 0 CHG=-1
M  V30 31 F 12.2276 -4.07553 0.0 0
M  V30 32 F 11.3758 -2.60024 0.0 0
M  V30 33 F 10.5241 -3.09201 0.0 0
M  V30 34 F 12.2276 -3.09201 0.0 0
M  V30 35 F 11.3758 -4.5673 0.0 0
M  V30 END ATOM
M  V30 BEGIN BOND
M  V30 1 2 3 1
M  V30 2 2 4 2
M  V30 3 1 1 5
M  V30 4 1 2 3
M  V30 5 2 5 6
M  V30 6 1 6 4
M  V30 7 1 2 7
M  V30 8 2 9 7
M  V30 9 2 10 8
M  V30 10 1 7 11
M  V30 11 1 8 9
M  V30 12 2 11 12
M  V30 13 1 12 10
M  V30 14 2 15 13
M  V30 15 2 16 14
M  V30 16 1 13 17
M  V30 17 1 14 15
M  V30 18 2 17 18
M  V30 19 1 18 16
M  V30 20 1 16 19
M  V30 21 2 21 19
M  V30 22 2 22 20
M  V30 23 1 19 23
M  V30 24 1 20 21
M  V30 25 2 23 24
M  V30 26 1 24 22
M  V30 27 10 11 25
M  V30 28 10 25 21
M  V30 29 10 25 14
M  V30 30 10 25 4
M  V30 31 10 25 26
M  V30 32 10 25 27
M  V30 33 3 27 28
M  V30 34 1 29 30
M  V30 35 1 30 31
M  V30 36 1 30 32
M  V30 37 1 30 33
M  V30 38 1 30 34
M  V30 39 1 30 35
M  V30 END BOND
M  V30 END BOND
M  V30 END CTAB
M  V30 END CTAB
Line 459: Line 661:


==== Investigations ====
==== Investigations ====
{{#experimentlist:|form=Photocatalytic_CO2_conversion_experiments|name=Table 1}}
{{#experimentlist: |form=Photocatalytic_CO2_conversion_experiments|name=CO2 reduction experiments}}


{{#experimentlist:|form=Photocatalytic_CO2_conversion_experiments|name=Table 2}}
{{#experimentlist: |form=Photocatalytic_CO2_conversion_experiments|name=Optimization of concentrations}}


{{#experimentlist:|form=Cyclic_Voltammetry_experiments|name=Table 3 - CV}}
{{#experimentlist:|form=Cyclic_Voltammetry_experiments|name=Table 3 - CV}}
Line 469: Line 671:


==== Additives ====
==== Additives ====
No additives were used in the described experiments.
No additives were used in the described experiments.[[Category:Publication]]

Latest revision as of 15:15, 5 July 2024


Abstract[edit | edit source]

Summary[edit | edit source]

A photochemical reduction of CO2 to formic acid was shown using a system containing an iridium-based photosensitizer, ruthenium photocatalyst and triethanolamine as the electron donor. Turnover numbers up to 526 and a selectivity of 80% towards formic acid were observed if the reaction was performed with [Ir(ppy)2(bpy)]PF6 ([Ir(ppy)2(bpy)][PF6]) as the photosensitizer and [Ru(bpy)2(Cl)(CO)]PF6 (100837) as the catalyst. The experiments were conducted under irradiation with Hg-lamp equipped with a λ=400–700 nm filter.

Advances and special progress[edit | edit source]

The employed photocatalytic system showed activity for the photoreduction of Na2CO3 to formic acid as well. A TON of 53 was observed after 5h reaction time.

Additional remarks[edit | edit source]

Experiments using different electron and proton donors such as triethylamine (TEA) and 1-benzyl-1,4-dihydronicotinamide (BNAH) were unsuccessful as the observed activities were lower than those obtained in the presence of TEOA.

Content of the published article in detail[edit | edit source]

The article contains results for the reduction of CO2 to formic under visible-light catalysis using ruthenium complexes as catalysts, the iridium complex [Ir(ppy)2(bpy)]PF6 ([Ir(ppy)2(bpy)][PF6]) as a photosensitizer and triethanolamine as the electron donor. The catalytic system performs best (referring to the TON of HCOOH production) with [Ru(bpy)2(Cl)(CO)]PF6 (100837) as photocatalyst.

Catalysts[edit | edit source]

Ru(bpy)2Cl2 Ru(bpy)2CO3 [Ru(bpy)2ClCO][PF6] [Ru(bpy)(H2O)(CO)][PF6] [Ru(bpy)(AcMe)2][PF6] [Ru(bpy)2HCO][PF6]

Photosensitizer[edit | edit source]

[Ir(ppy)2(bpy)][PF6]

Investigations[edit | edit source]

catcat conc [µM]PSPS conc [mM]e-Dsolvent A.λexc [nm]TON COTON H2TON HCOOH.
1.

Ru(bpy)2Cl2

25

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7001213
2.

Ru(bpy)2CO3

25

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7002421
3.

[Ru(bpy)2ClCO][PF6]

25

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 70013862
4.

[Ru(bpy)2HCO][PF6]

25

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7008834
5.

[Ru(bpy)(H2O)(CO)][PF6]

25

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7007940
6.

[Ru(bpy)(AcMe)2][PF6]

25

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7003427
Investigation-Name: CO2 reduction experiments
catcat conc [µM]PSPS conc [mM]e-Dsolvent A.λexc [nm]TON COTON H2TON HCOOH.
1.

Ru(bpy)2Cl2

6.2

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7003926
2.

Ru(bpy)2CO3

6.2

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 70031139
3.

[Ru(bpy)2ClCO][PF6]

6.2

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7001919117
4.

[Ru(bpy)2HCO][PF6]

6.2

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7002116107
5.

[Ru(bpy)(H2O)(CO)][PF6]

6.2

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 700211475
6.

[Ru(bpy)(AcMe)2][PF6]

6.2

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 70041264
7.

[Ru(bpy)2ClCO][PF6]

3.1

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7003633296
8.

[Ru(bpy)2HCO][PF6]

3.1

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7001629145
9.

[Ru(bpy)(H2O)(CO)][PF6]

3.1

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7003428211
10.

[Ru(bpy)2ClCO][PF6]

1.6

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7004067419
11.

[Ru(bpy)2HCO][PF6]

1.6

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7002562225
12.

[Ru(bpy)(H2O)(CO)][PF6]

1.6

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 7004565335
13.

[Ru(bpy)(AcMe)2][PF6]

1.6

[Ir(ppy)2(bpy)][PF6]

0.025

TEOA

NMP

400 - 70044475
Investigation-Name: Optimization of concentrations
analytereduction potentialsolventelectrolyte..WE..RE.
1.

Ru(bpy)2Cl2

0,-2.11

MeCN

TBABF4

glassy carbonAg/AgNO3 in MeCN
2.

Ru(bpy)2CO3

0.45,-1.97

MeCN

TBABF4

glassy carbonAg/AgNO3 in MeCN
3.

[Ru(bpy)2ClCO][PF6]

1.22,-1.75

MeCN

TBABF4

glassy carbonAg/AgNO3 in MeCN
4.

[Ru(bpy)2HCO][PF6]

1.20,-1.61

MeCN

TBABF4

glassy carbonAg/AgNO3 in MeCN
Investigation-Name: Table 3 - CV

Sacrificial electron donor[edit | edit source]

In this study, the experiments were done with the sacrificial electron donor TEOA (100507).

Additives[edit | edit source]

No additives were used in the described experiments.

Investigations