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NHC‐Containing Manganese(I) Electrocatalysts for the Two‐Electron Reduction of CO 2
Author(s) -
Agarwal Jay,
Shaw Travis W.,
Stanton Charles J.,
Majetich George F.,
Bocarsly Andrew B.,
Schaefer Henry F.
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201311099
Subject(s) - manganese , catalysis , electrolysis , reduction (mathematics) , electron , materials science , chemistry , electrode , physics , metallurgy , organic chemistry , geometry , mathematics , quantum mechanics , electrolyte
The synthesis and characterization of the first catalytic manganese N‐heterocyclic carbene complexes are reported: MnBr( N ‐methyl‐ N ′‐2‐pyridylbenzimidazol‐2‐ylidine)(CO) 3 and MnBr( N ‐methyl‐ N ′‐2‐pyridylimidazol‐2‐ylidine)(CO) 3 . Both new species mediate the reduction of CO 2 to CO following two‐electron reduction of the Mn I center, as observed with preparative scale electrolysis and verified with 13 CO 2 . The two‐electron reduction of these species occurs at a single potential, rather than in two sequential steps separated by hundreds of millivolts, as is the case for previously reported MnBr(2,2′‐bipyridine)(CO) 3 . Catalytic current enhancement is observed at voltages similar to MnBr(2,2′‐bipyridine)(CO) 3 .