Editing Merging an organic TADF photosensitizer and a simple terpyridine–Fe(iii) complex for photocatalytic CO2 reduction

{{DOI|doi=10.1039/d0cc05047d}}
[[Category:Photocatalytic CO2 conversion to CO]][[Category:Publication]]
{{BaseTemplate}}
===Abstract===
====Summary====
The photochemical reduction of CO<sub>2</sub> to CO was shown using the iron complex {{#moleculelink:|link=GKZBKMSETZXTMT-UHFFFAOYSA-K|image=false|width=300|height=200}} in combination with the organic photosensitizer {{#moleculelink:|link=PRWATGACIORDEL-UHFFFAOYSA-N|image=false|width=300|height=200}}. Turnover numbers (TONs) of up to 2250 and a selectivity of 99.3% for CO were reached in DMF/H<sub>2</sub>O. The experiments were conducted under visible-light irradiation (λ > 420 nm) with TEA (see section SEDs below) as sacrificial electron donor.
====Advances and special progress====
The presented study contains the first example for the use of an organic thermally activated delayed fluorescence (TADF) compound as a photosensitizer in CO<sub>2</sub> reduction.

====Additional remarks====
===Content of the published article in detail===
The article contains results of a study for the reduction of CO<sub>2</sub> to CO using an iron complex and an organic TADF photosensitizer. The catalytic system performs best (referring to the TON of CO production) in DMF.
====Catalyst====
<chemform smiles="C1C=CN2~[Fe]3(~N4=CC=CC=C4C4C=C(C5C=CC(C)=CC=5)C=C(N=4~3)C=2C=1)(Cl)(Cl)Cl" inchi="1S/C22H17N3.3ClH.Fe/c1-16-8-10-17(11-9-16)18-14-21(19-6-2-4-12-23-19)25-22(15-18)20-7-3-5-13-24-20;;;;/h2-15H,1H3;3*1H;/q;;;;+3/p-3" inchikey="GKZBKMSETZXTMT-UHFFFAOYSA-K" height="200px" width="300px" float="none">
  -INDIGO-05102414152D

  0  0  0  0  0  0  0  0  0  0  0 V3000
M  V30 BEGIN CTAB
M  V30 COUNTS 29 34 0 0 0
M  V30 BEGIN ATOM
M  V30 1 C 4.65985 -6.82507 0.0 0
M  V30 2 C 6.39015 -6.82459 0.0 0
M  V30 3 C 5.52664 -6.32497 0.0 0
M  V30 4 N 6.39015 -7.82553 0.0 0
M  V30 5 C 4.65985 -7.83002 0.0 0
M  V30 6 C 5.52882 -8.32503 0.0 0
M  V30 7 C 7.25641 -6.32499 0.0 0
M  V30 8 C 8.12013 -4.82569 0.0 0
M  V30 9 C 7.25603 -5.32428 0.0 0
M  V30 10 C 8.98731 -5.32558 0.0 0
M  V30 11 N 8.12705 -6.82688 0.0 0
M  V30 12 C 8.98989 -6.32126 0.0 0
M  V30 13 C 9.85818 -6.81733 0.0 0
M  V30 14 C 11.5885 -6.81569 0.0 0
M  V30 15 C 10.7246 -6.31664 0.0 0
M  V30 16 C 11.5891 -7.81663 0.0 0
M  V30 17 N 9.85885 -7.82228 0.0 0
M  V30 18 C 10.7282 -8.31671 0.0 0
M  V30 19 C 8.11993 -3.82569 0.0 0
M  V30 20 C 7.25335 -2.32802 0.0 0
M  V30 21 C 7.25309 -3.32566 0.0 0
M  V30 22 C 8.11986 -1.82697 0.0 0
M  V30 23 C 8.9899 -3.32263 0.0 0
M  V30 24 C 8.98344 -2.32257 0.0 0
M  V30 25 C 8.11823 -0.826972 0.0 0
M  V30 26 Fe 8.1 -8.325 0.0 0
M  V30 27 Cl 7.175 -8.95 0.0 0
M  V30 28 Cl 8.125 -9.375 0.0 0
M  V30 29 Cl 9.025 -8.925 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 1 12 13
M  V30 15 2 15 13
M  V30 16 2 16 14
M  V30 17 1 13 17
M  V30 18 1 14 15
M  V30 19 2 17 18
M  V30 20 1 18 16
M  V30 21 1 8 19
M  V30 22 2 21 19
M  V30 23 2 22 20
M  V30 24 1 19 23
M  V30 25 1 20 21
M  V30 26 2 23 24
M  V30 27 1 24 22
M  V30 28 1 22 25
M  V30 29 1 27 26
M  V30 30 1 28 26
M  V30 31 1 26 29
M  V30 32 8 4 26
M  V30 33 8 26 11
M  V30 34 8 26 17
M  V30 END BOND
M  V30 END CTAB
M  END
</chemform>
====Photosensitizer====
<chemform smiles="" inchi="" inchikey="PRWATGACIORDEL-UHFFFAOYSA-N" height="200px" width="300px" float="none"></chemform>

====Investigation====
{{#experimentlist:|form=Photocatalytic_CO2_conversion_experiments|name=photocatalytic reduction of CO2 to CO|importFile=}}

====Sacrificial electron donor====
In this study, the experiments were done with the sacrificial electron donor TEA ({{#moleculelink:|link=ZMANZCXQSJIPKH-UHFFFAOYSA-N|image=false|width=300|height=200}}).
====Additives====
In this study, no additives were tested. Control experiments with other photosensitizers (Ru(bpy)<sub>3</sub>, Fluorescein and Eosin Y) and catalysts (FeCl3) were conducted.

<chemform smiles="C(O)1C=CC2C(C3C=CC=CC=3C(=O)O)=C3C=CC(=O)C=C3OC=2C=1" inchi="1S/C20H12O5/c21-11-5-7-15-17(9-11)25-18-10-12(22)6-8-16(18)19(15)13-3-1-2-4-14(13)20(23)24/h1-10,21H,(H,23,24)" inchikey="YKGGGCXBWXHKIZ-UHFFFAOYSA-N" height="200px" width="300px" float="none">
  -INDIGO-05162413102D

  0  0  0  0  0  0  0  0  0  0  0 V3000
M  V30 BEGIN CTAB
M  V30 COUNTS 25 28 0 0 0
M  V30 BEGIN ATOM
M  V30 1 C 5.90985 -3.45007 0.0 0
M  V30 2 C 7.64015 -3.44959 0.0 0
M  V30 3 C 6.77664 -2.94997 0.0 0
M  V30 4 C 7.64015 -4.45053 0.0 0
M  V30 5 C 5.90985 -4.45502 0.0 0
M  V30 6 C 6.77882 -4.95003 0.0 0
M  V30 7 O 8.50465 -2.95121 0.0 0
M  V30 8 C 9.37183 -3.45155 0.0 0
M  V30 9 C 8.5108 -4.95287 0.0 0
M  V30 10 C 9.37403 -4.44746 0.0 0
M  V30 11 C 10.2309 -2.95378 0.0 0
M  V30 12 C 11.0948 -3.44969 0.0 0
M  V30 13 C 10.2414 -4.94535 0.0 0
M  V30 14 C 11.0992 -4.44059 0.0 0
M  V30 15 O 11.9591 -2.94669 0.0 0
M  V30 16 O 5.0439 -2.94995 0.0 0
M  V30 17 C 8.51399 -5.95286 0.0 0
M  V30 18 C 9.38056 -7.45053 0.0 0
M  V30 19 C 9.38082 -6.45289 0.0 0
M  V30 20 C 8.51406 -7.95158 0.0 0
M  V30 21 C 7.64402 -6.45592 0.0 0
M  V30 22 C 7.65048 -7.45597 0.0 0
M  V30 23 C 10.2468 -6.05284 0.0 0
M  V30 24 O 11.0128 -6.45284 0.0 0
M  V30 25 O 10.2468 -5.38681 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 8 7
M  V30 8 1 4 9
M  V30 9 1 7 2
M  V30 10 2 9 10
M  V30 11 1 10 8
M  V30 12 1 12 11
M  V30 13 1 10 13
M  V30 14 2 11 8
M  V30 15 2 13 14
M  V30 16 1 14 12
M  V30 17 2 12 15
M  V30 18 1 1 16
M  V30 19 1 9 17
M  V30 20 2 19 17
M  V30 21 2 20 18
M  V30 22 1 17 21
M  V30 23 1 18 19
M  V30 24 2 21 22
M  V30 25 1 22 20
M  V30 26 1 19 23
M  V30 27 1 23 24
M  V30 28 2 23 25
M  V30 END BOND
M  V30 END CTAB
M  END
</chemform>