Highly efficient and selective visible-light driven CO2-to-CO conversion by a Co-based cryptate in H2O-CH3CN solution

Abstract

Summary

A photochemical reduction of CO₂ to CO was shown using the copper cryptates 100956 or 100957 as catalyst in combination with the ruthenium photosensitizer [Ru(phen)3][PF6]2. Turnover numbers (TONs) up to 51392 and a selectivity of 98% for CO were reached in MeCN/H₂O. The experiments were conducted under visible-light irradiation (λ = 450 nm) using TEOA 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 a copper complex as a catalyst. The catalytic system performs best (referring to the TON of CO production) in MeCN/H₂O with complex 100956.

Catalyst

100956 100957

Photosensitizer

[Ru(phen)3][PF6]2

Investigation

	cat	cat conc [µM]	PS	PS conc [mM]	e-D	e-D conc [M]	solvent A	.	.	.	.	λexc [nm]	.	TON CO	.	.
1.	Molecule:100956	0.000025	[Ru(phen)3][PF6]2	0.4	TEOA	0.3	MeCN					450		33792
2.	Molecule:100957	0.000025	[Ru(phen)3][PF6]2	0.4	TEOA	0.3	MeCN					450		18656
3.			[Ru(phen)3][PF6]2	0.4	TEOA	0.3	MeCN					450		0
4.	Molecule:100957	0.000025			TEOA	0.3	MeCN					450		0
5.	Molecule:100957	0.000025	[Ru(phen)3][PF6]2	0.4	TEOA	0.3	MeCN							0
6.	Molecule:100957	0.000025	[Ru(phen)3][PF6]2	0.4			MeCN					450		0
7.	Molecule:100957	0.0005	[Ru(phen)3][PF6]2	0.4	TEOA	0.3	MeCN					450		600
8.	Molecule:100957	0.001	[Ru(phen)3][PF6]2	0.4	TEOA	0.3	MeCN					450		1582
9.	Molecule:100957	0.0000125	[Ru(phen)3][PF6]2	0.4	TEOA	0.3	MeCN					450		51392

Investigation-Name: photocatalytic CO2 conversion under different conditionsExport

Sacrificial electron donor

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

Additives

In this study, no additives were tested.