Carbon dioxide reduction via light activation of a ruthenium–Ni(cyclam) complex

Abstract

Summary

A photochemical reduction of CO₂ to CO was shown using the ruthenium-Ni(cyclam) complex [Ni(cyclam-trzbpy)Ru(bpy)2][PF6]4. Turnover numbers (TONs) of 5.2 for CO using the ruthenium catalyst were obtained in acetonitrile/water. The experiments were conducted under visible-light irradiation (λ = 460 nm) in the presence of an ascorbate buffer (see section SEDs below).

Advances and special progress

A novel method to connect chromophores with catalytic centers to allow for light-catalyzed CO₂ reduction was developed.

Content of the published article in detail

The article contains results for the reduction of CO₂ to CO under visible-light catalysis using a ruthenium-Ni(cyclam) complex. The performance of the catalytic system was investigated in acetonitrile/water.

Catalyst

[Ni(cyclam-trzbpy)Ru(bpy)2][PF6]4

Investigation

	cat	cat conc [µM]	e-D	e-D conc [M]	solvent A	.	.	λexc [nm]	.	TON CO	TON H2	.
1.	[Ni(cyclam-trzbpy)Ru(bpy)2][PF6]4	0.03	Molecule:100861	0.1	MeCN			450		5.2	2

Experiment-Name: Photoreduction of CO2 resultExport

Sacrificial electron donor

In this study, the experiments were done with the sacrificial reductant sodium ascorbate (L-ascorbate, sodium).

L-ascorbate, sodium

Additives

In this study, no additives were tested.