Communication
Protonation Equilibrium and Hydrogen Production by a Dinuclear Cobalt–Hydride Complex Reduced by Cobaltocene with Trifluoroacetic Acid
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† Department of Bioinspired Science, Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
‡ Department of Material and Life Science, Graduate School of Engineering, ALCA, Japan Science and Technology Agency, Osaka University, Suita, Osaka 565-0871, Japan
§ Institute of Chemical Research of Catalonia (ICIQ), Avinguda Països Catalans 16, E-43007 Tarragona, Spain
J. Am. Chem. Soc., Article ASAP
DOI: 10.1021/ja408080z
Publication Date (Web): September 25, 2013
Copyright © 2013 American Chemical Society
Abstract
A dinuclear Co complex with bis(pyridyl)pyrazolato (bpp–) and terpyridine (trpy) ligands, [CoIII2(trpy)2(μ-bpp)(OH)(OH2)]4+ (14+), undergoes three-electron reduction by cobaltocene in acetonitrile to produce 1+, which is in the protonation equilibrium with the CoIICoIII–hydride complex, and the further protonation of the hydride by trifluoroacetic acid yields hydrogen quantitatively. The kinetic study together with the detection of the CoIICoIII-hydride complex revealed the mechanism of the hydrogen production by the reaction of 1+with trifluoroacetic acid.
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