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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==== Catalysts ====
==== Catalysts ====
<chemform smiles="C1C=CN2~[Ru+2](~[Cl-])(~[Cl-])3(~N4C=CC=CC=4C4N~3=CC=CC=4)~N3C=CC=CC=3C=2C=1" inchikey="MGAJEYXQYJBLQL-UHFFFAOYSA-L" inchi="1S/2C10H8N2.2ClH.Ru/c2*1-3-7-11-9(5-1)10-6-2-4-8-12-10;;;/h2*1-8H;2*1H;/q;;;;+2/p-2" float="none" width="200" height="200" r1="" r2="">
<chemform smiles="C1C=CN2[Ru+2]([Cl-])([Cl-])3(N4C=CC=CC=4C4C=CC=CN=43)N3=CC=CC=C3C=2C=1" inchi="1S/2C10H8N2.2ClH.Ru/c2*1-3-7-11-9(5-1)10-6-2-4-8-12-10;;;/h2*1-8H;2*1H;/q;;;;+2/p-2" inchikey="MGAJEYXQYJBLQL-UHFFFAOYSA-L" height="200px" width="300px" float="none">
   -INDIGO-01092415422D
   -INDIGO-01122412102D


   0  0  0  0  0  0  0  0  0  0  0 V3000
   0  0  0  0  0  0  0  0  0  0  0 V3000
Line 25: Line 25:
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M  V30 COUNTS 27 32 0 0 0
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M  V30 BEGIN ATOM
M  V30 1 C 4.42164 -3.4051 0.0 0
M  V30 1 C 6.89063 -3.78182 0.0 0
M  V30 2 C 6.16573 -3.41315 0.0 0
M  V30 2 C 8.38676 -3.78141 0.0 0
M  V30 3 C 5.23126 -2.93902 0.0 0
M  V30 3 C 7.64012 -3.3494 0.0 0
M  V30 4 N 6.24607 -4.34967 0.0 0
M  V30 4 N 8.38676 -4.64689 0.0 0
M  V30 5 C 4.43988 -4.2752 0.0 0
M  V30 5 C 6.89063 -4.65077 0.0 0
M  V30 6 C 5.33647 -4.80741 0.0 0
M  V30 6 C 7.642 -5.07879 0.0 0
M  V30 7 C 7.1536 -2.01998 0.0 0
M  V30 7 C 9.13579 -3.34942 0.0 0
M  V30 8 C 8.69562 -2.15033 0.0 0
M  V30 8 C 9.88323 -2.05337 0.0 0
M  V30 9 C 7.97052 -1.65293 0.0 0
M  V30 9 C 9.13586 -2.48414 0.0 0
M  V30 10 C 8.6606 -3.11885 0.0 0
M  V30 10 C 10.6329 -2.48595 0.0 0
M  V30 11 C 7.04069 -2.96795 0.0 0
M  V30 11 N 9.88841 -3.78374 0.0 0
M  V30 12 N 7.81868 -3.57293 0.0 0
M  V30 12 C 10.6347 -3.3469 0.0 0
M  V30 13 C 5.6923 -5.52361 0.0 0
M  V30 13 C 6.91225 -6.35421 0.0 0
M  V30 14 C 6.93663 -6.52444 0.0 0
M  V30 14 N 8.40838 -6.35379 0.0 0
M  V30 15 N 6.60503 -5.6549 0.0 0
M  V30 15 C 7.66173 -5.92179 0.0 0
M  V30 16 C 6.34029 -7.29343 0.0 0
M  V30 16 C 8.40838 -7.21927 0.0 0
M  V30 17 C 5.12026 -6.37657 0.0 0
M  V30 17 C 6.91225 -7.22316 0.0 0
M  V30 18 C 5.48652 -7.18714 0.0 0
M  V30 18 C 7.66362 -7.65118 0.0 0
M  V30 19 C 7.64521 -6.74796 0.0 0
M  V30 19 C 9.15762 -7.65089 0.0 0
M  V30 20 C 9.23795 -6.29939 0.0 0
M  V30 20 C 10.6538 -7.64803 0.0 0
M  V30 21 N 8.25086 -6.00768 0.0 0
M  V30 21 N 9.9064 -7.21724 0.0 0
M  V30 22 C 9.43514 -7.33957 0.0 0
M  V30 22 C 10.6552 -8.51351 0.0 0
M  V30 23 C 7.96229 -7.64558 0.0 0
M  V30 23 C 9.15904 -8.51983 0.0 0
M  V30 24 C 8.77162 -7.93243 0.0 0
M  V30 24 C 9.91111 -8.94663 0.0 0
M  V30 25 Cl 8.45093 -4.23617 0.0 0 CHG=-1
M  V30 25 Ru 9.93164 -5.38338 0.0 0 CHG=2
M  V30 26 Cl 8.54195 -5.09895 0.0 0 CHG=-1
M  V30 26 Cl 11.3477 -4.48338 0.0 0 CHG=-1
M  V30 27 Ru 7.51723 -4.8062 0.0 0 CHG=2
M  V30 27 Cl 11.4477 -6.20838 0.0 0 CHG=-1
M  V30 END ATOM
M  V30 END ATOM
M  V30 BEGIN BOND
M  V30 BEGIN BOND
Line 60: Line 60:
M  V30 5 2 5 6
M  V30 5 2 5 6
M  V30 6 1 6 4
M  V30 6 1 6 4
M  V30 7 2 9 7
M  V30 7 1 2 7
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M  V30 30 10 25 4
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M  V30 31 10 25 26
M  V30 32 8 27 25
M  V30 32 10 25 27
M  V30 END BOND
M  V30 END BOND
M  V30 END CTAB
M  V30 END CTAB
Line 162: Line 162:
M  V30 34 1 26 25
M  V30 34 1 26 25
M  V30 35 1 28 25
M  V30 35 1 28 25
M  V30 END BOND
M  V30 END CTAB
M  END
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  -INDIGO-01092415522D
  0  0  0  0  0  0  0  0  0  0  0 V3000
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M  V30 4 F 9.633 -4.55 0.0 0
M  V30 5 F 8.767 -5.05 0.0 0
M  V30 6 F 10.499 -5.05 0.0 0
M  V30 7 F 9.633 -6.55 0.0 0
M  V30 8 C 3.00985 -3.67507 0.0 0
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M  V30 22 C 3.90164 -6.14997 0.0 0
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M  V30 24 C 3.03485 -7.65502 0.0 0
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M  V30 30 C 5.6333 -9.15464 0.0 0
M  V30 31 C 6.50308 -9.64824 0.0 0
M  V30 32 Ru 6.48118 -5.65053 0.0 0 CHG=2
M  V30 33 R# 7.4971 -4.94171 0.0 0 RGROUPS=(1 1)
M  V30 34 R# 7.4972 -6.22553 0.0 0 RGROUPS=(1 2)
M  V30 END ATOM
M  V30 BEGIN BOND
M  V30 1 1 1 2
M  V30 2 1 2 3
M  V30 3 1 2 4
M  V30 4 1 2 5
M  V30 5 1 2 6
M  V30 6 1 2 7
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M  V30 END BOND
M  V30 END CTAB
M  END
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  -INDIGO-01092415502D
  0  0  0  0  0  0  0  0  0  0  0 V3000
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M  V30 22 C 7.47083 -1.42609 0.0 0
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M  V30 25 N 7.47682 -3.42729 0.0 0
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M  V30 40 Ru 7.45618 -5.32553 0.0 0 CHG=2
M  V30 41 R# 8.88398 -4.525 0.0 0 RGROUPS=(1 1)
M  V30 END ATOM
M  V30 BEGIN BOND
M  V30 1 1 1 2
M  V30 2 1 2 3
M  V30 3 1 2 4
M  V30 4 1 2 5
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M  V30 END CTAB

Revision as of 12:10, 12 January 2024


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Abstract

Summary

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

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

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

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

Ru(bpy)2Cl2 Ru(bpy)2CO3

Photosensitizer

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

Investigations

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

Ru(bpy)2Cl2

0.025

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

0.025

TEOA

NMP

400 - 7001213
2.

Ru(bpy)2CO3

0.025

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

0.025

TEOA

NMP

400 - 7002421
3.

[Ru(bpy)2ClCO][PF6]

0.025

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

0.025

TEOA

NMP

400 - 70013862
4.

[Ru(bpy)2HCO][PF6]

0.025

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

0.025

TEOA

NMP

400 - 7008834
5.

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

0.025

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

0.025

TEOA

NMP

400 - 7007940
6.

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

0.025

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

0.025

TEOA

NMP

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

Ru(bpy)2Cl2

0.0062

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

0.025

TEOA

NMP

400 - 7003926
2.

Ru(bpy)2CO3

0.0062

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

0.025

TEOA

NMP

400 - 70031139
3.

[Ru(bpy)2ClCO][PF6]

0.0062

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

0.025

TEOA

NMP

400 - 7001919117
4.

[Ru(bpy)2HCO][PF6]

0.0062

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

0.025

TEOA

NMP

400 - 7002116107
5.

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

0.0062

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

0.025

TEOA

NMP

400 - 700211475
6.

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

0.0062

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

0.025

TEOA

NMP

400 - 70041264
7.

[Ru(bpy)2ClCO][PF6]

0.0031

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

0.025

TEOA

NMP

400 - 7003633296
8.

[Ru(bpy)2HCO][PF6]

0.0031

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

0.025

TEOA

NMP

400 - 7001629145
9.

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

0.0031

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

0.025

TEOA

NMP

400 - 7003428211
10.

[Ru(bpy)2ClCO][PF6]

0.0016

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

0.025

TEOA

NMP

400 - 7004067419
11.

[Ru(bpy)2HCO][PF6]

0.0016

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

0.025

TEOA

NMP

400 - 7002562225
12.

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

0.0016

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

0.025

TEOA

NMP

400 - 7004565335
13.

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

0.0016

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

0.025

TEOA

NMP

400 - 70044475
Investigation-Name: Table 2
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

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

Additives

No additives were used in the described experiments.

Investigations