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Issue 21, 2020
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Heterogeneous aqueous CO2 reduction by rhenium(i) tricarbonyl diimine complexes with a non-chelating pendant pyridyl group

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Abstract

Electrocatalytic CO2 reduction in water using a series of chlorotricarbonylrhenium(I) diimine complexes deposited on pyrolytic graphite electrodes is described. Two known CO2 reduction catalysts (with diimine = 4,4′-di-tert-butyl-2,2′-bipyridine or 2-(2′-quinolyl)benzimidazole), that are highly active in organic solvent, proved to be only weakly active in water. In contrast, Cl(CO)3Re(L) complexes with tridentate nitrogen-containing ligands (L = 4,4′,4′′-tri-tert-butyl-2,2′:6′,2′′-terpyridine or 2,6-bis(2-benzimidazolyl)pyridine) were better CO2 reduction catalysts. In those Cl(CO)3Re(L) complexes, only two N-atoms of the ligand are coordinated to the rhenium, leaving the third arm of the ligands to support activated, CO2-bound intermediates. The 2,6-bis(2-pyridyl)pyridine (terpy) complex was the most active, with substantial activity at alkaline pH.

Graphical abstract: Heterogeneous aqueous CO2 reduction by rhenium(i) tricarbonyl diimine complexes with a non-chelating pendant pyridyl group

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Supplementary files

Article information


Submitted
08 Apr 2020
Accepted
06 May 2020
First published
13 May 2020

Dalton Trans., 2020,49, 7078-7083
Article type
Paper

Heterogeneous aqueous CO2 reduction by rhenium(I) tricarbonyl diimine complexes with a non-chelating pendant pyridyl group

S. Sinha, A. Sonea, C. A. Gibbs and J. J. Warren, Dalton Trans., 2020, 49, 7078
DOI: 10.1039/D0DT01300E

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