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Artificial Photosynthesis
Hydricity of Ruthenium(II) Hydride Complexes
Despite the fundamental importance of the hydricity of a transition metal hydride (ΔGºH- for the reaction M–H => M+ + H–) in a range of reactions important in catalysis and solar energy storage, ours (J. Am. Chem. Soc. 2009, 131, 2794) are the only values reported for water solvent, and there has been no basis for comparison of these with the wider range already determined for acetonitrile solvent, in particular. We have used a variety of approaches to determine hydricity values in acetonitrile of Ru(II) hydride complexes previously studied in water. Comparison of the hydricity values for acetonitrile and water reveals a flattening or compression of the hydricity range upon transferring the hydride complexes to water.
J. Am. Chem. Soc. 2012, 134, 15743-15757, DOI: 10.1021/ja302937q.