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Ligand Transformations and Efficient Proton/Water Reduction with Cobalt Catalysts Based on Pentadentate Pyridine‐Rich Environments
Author(s) -
Basu Debashis,
Mazumder Shivnath,
Shi Xuetao,
Baydoun Habib,
Niklas Jens,
Poluektov Oleg,
Schlegel H. Bernhard,
Verani Cláudio N.
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201409813
Subject(s) - chemistry , cobalt , pyridine , protonation , catalysis , amide , ligand (biochemistry) , imine , amine gas treating , redox , photochemistry , medicinal chemistry , polymer chemistry , inorganic chemistry , organic chemistry , ion , biochemistry , receptor
A series of cobalt complexes with pentadentate pyridine‐rich ligands is studied. An initial Co II amine complex 1 is prone to aerial oxidation yielding a Co III imine complex 2 that is further converted into an amide complex 4 in presence of adventitious water. Introduction of an N‐methyl protecting group to the ligand inhibits this oxidation and gives rise to the Co II species 5 . Both the Co III 4 and Co II 5 show electrocatalytic H 2 generation in weakly acidic media as well as in water. Mechanisms of catalysis seem to involve the protonation of a Co II H species generated in situ.