Abstract
The electron transfre sequence has been determined for a series of bis 2,2′-bipyridine (bpy) complexes of ruthenium(II) [Ru(bpy) 2L 2) x at temperature down to −54°C. The reduction sequence at the lowest temperature is consistent with the predictions of the spatially isolated redox orbital model, for which the reduction electrons enter π* orbitals localized on the separate bipyridine ligands. The decomposition reactions that follow addition of two (or more) electrons for the complexes involve the stepwise loss of the ancillary ligand, L, and do not appear to result in the loss of bpy. Activation energies obtained for the decomposition reaction imply a solvent determined transition state.
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