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Hydrogen Evolution Mediated by Cobalt Diimine‐Dioxime Complexes: Insights into the Role of the Ligand Acid/Base Functionalities.
Author(s) -
Sun Dongyue,
Karippara Harshan Aparna,
Pécaut Jacques,
HammesSchiffer Sharon,
Costentin Cyrille,
Artero Vincent
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100413
Subject(s) - diimine , protonation , cobalt , ligand (biochemistry) , chemistry , catalysis , hydride , intramolecular force , proton , hydrogen , photochemistry , medicinal chemistry , stereochemistry , inorganic chemistry , organic chemistry , receptor , physics , ion , biochemistry , quantum mechanics
The benchmarking of the performance for H 2 evolution of cobalt diimine‐dioxime catalysts is provided based on a comprehensive study of their catalytic mechanism. The latter follows an ECE'CC pathway with intermediate formation of a Co(II)‐hydride intermediate and second protonation possibly at a basic site of the ligand, acting as a proton relay. This suggests an intramolecular coupling between the hydride and protonated ligand as the proton concentration‐independent rate‐determining step controlling the turnover frequency for H 2 evolution.