Photocatalytic Reduction of CO2 by Highly Efficient Homogeneous FeII Catalyst based on 2,6-Bis(1’,2’,3’-triazolyl-methyl)pyridine. Comparison with Analogues.

Abstract

Summary

A photochemical reduction of CO₂ to CO was shown using the iron complex (100941) as catalyst in combination with the copper photosensitizer Molecule with key SVWABAAUBHILMW-UHFFFAOYSA-P does not exist.. Turnover numbers (TONs) of 576 and a selectivity of 67% for CO were reached in MeCN/TEOA. The experiments were conducted under visible-light irradiation (λ = 420 nm) using BIH as sacrificial electron donor (see section SEDs below). The homoleptic iron complex Molecule with key SIMPDUKIPFZEDX-UHFFFAOYSA-N does not exist. and the cobalt complexes (100944) and Molecule with key QMZVNZOKJUBNLZ-UHFFFAOYSA-N does not exist. were tested for CO₂ reduction as well, but did not show substantial conversion of CO₂ to CO.

Advances and special progress

The authors reported a iron complex with one of the highest activities for CO₂ reduction among earth-abundant systems with monometallic iron catalysts.

Additional remarks

In addition to the production of CO, a substantial amount of H₂ (TON of 287) was formed in the reduction process with complex (100941).

Content of the published article in detail

The article contains results for the reduction of CO₂ to CO under visible-light catalysis using the iron complex (100941) as a catalyst. The catalytic system performs best (referring to the TON of CO production) in MeCN/TEOA.

Catalyst

(100941) (100944)

Photosensitizer

Investigation

   REDIRECT Optimization of CO2 reduction conditionsInvestigation-Name: CO2 reduction experiments with different catalysts

		cat	cat conc [µM]	PS	PS conc [mM]	e-D	e-D conc [M]	solvent A	.	.	.	λexc [nm]	.	TON CO	TON H2	.	.
(edit)	1.	Molecule:100942	0.1	Molecule:100940	1.0	BIH	0.02	MeCN				420		7.8	2
(edit)	2.	Molecule:100944	0.1	Molecule:100940	1.0	BIH	0.02	MeCN				420		1.1	7.4
(edit)	3.	Molecule:100945	0.1	Molecule:100940	1.0	BIH	0.02	MeCN				420		0.7	4.9

Investigation-Name: CO2 reduction experiments testing different catalysts

Sacrificial electron donor

In this study, the experiments were done with the sacrificial electron donor BIH (100508).

Additives

In this study, control experiments with Hg and without CO₂ were conducted.