Water-Assisted Highly Efficient Photocatalytic Reduction of CO2 to CO with Noble Metal-Free Bis(terpyridine)iron(II) Complexes and an Organic Photosensitizer

Abstract

Summary

A photochemical reduction of CO₂ to CO was shown using the iron complexes 100947, 100948 and 100949 as catalysts in combination with the organic photosensitizer 4CzIPN. Turnover numbers (TONs) of 6320 and a selectivity of 99.4% for CO were reached in DMF/H₂O with catalyst 100949. The experiments were conducted under visible-light irradiation (λ = 440 nm) using TEA as sacrificial electron donor (see section SEDs below).

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 as a catalyst. The catalytic system performs best (referring to the TON of CO production) in DMF/H₂O.

Catalyst

100946 [Show R-Groups]

Photosensitizer

4CzIPN

Investigation

	cat	cat conc [µM]	PS	PS conc [mM]	e-D	e-D conc [M]	solvent A	.	.	.	λexc [nm]	.	TON CO	.	.
1.	Molecule:100949	0.01	4CzIPN	0.05	TEA	0.28	DMF				420-650		6320
2.	Molecule:100948	0.01	4CzIPN	0.05	TEA	0.28	DMF				420-650		2780
3.	Molecule:100947	0.01	4CzIPN	0.05	TEA	0.28	DMF				420-650		4500
4.	Molecule:100949	0.01	Ru(bpy)3	0.05	TEA	0.28	DMF				420-650		19
5.	Molecule:100949	0.01	4CzIPN	0.05	TEA	0.28	MeCN				420-650		992

Investigation-Name: photocatalytic CO2 conversionExport

Sacrificial electron donor

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

Additives

In this study, no additives were tested.