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 (100777). 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 (100777)

Investigation

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

Sacrificial electron donor

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

Additives

In this study, no additives were tested.