Comprehensive thermodynamic characterization of the metal-hydrogen bond in a series of cobalt-hydride complexes

Rebecca Ciancanelli, Bruce C. Noll, Daniel L DuBois, M. Rakowski DuBois

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Abstract

A detailed structural and thermodynamic study of a series of cobalt-hydride complexes is reported. This includes structural studies of [H2Co(dppe)2]+, HCo(dppe)2, [HCo(dppe)2(CH3CN)]+, and [Co(dppe)2-(CH3CN)]2+, where dppe = bis(diphenylphosphino)ethane. Equilibrium measurements are reported for one hydride- and two proton-transfer reactions. These measurements and the determinations of various electrochemical potentials were used to determine 11 of 12 possible homolytic and heterolytic solution Co-H bond dissociation free energies of [H2Co(dppe)2]+ and its monohydride derivatives. These values provide a useful framework for understanding observed and potential reactions of these complexes. These reactions include the disproportionation of [HCo(dppe)2]+ to form [Co(dppe)2]+ and [H2Co(dppe)2]+, the reaction of [Co(dppe)2]+ with H2, the protonation and deprotonation reactions of the various hydride species, and the relative ability of the hydride complexes to act as hydride donors.

Original languageEnglish
Pages (from-to)2984-2992
Number of pages9
JournalJournal of the American Chemical Society
Volume124
Issue number12
DOIs
Publication statusPublished - Mar 27 2002

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ASJC Scopus subject areas

  • Chemistry(all)

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