Abstract
The ESR spectra of reduced RuL/sub 3//sup n+/ complexes (L = 2,2'-bipyrimidine (bpm)) containing one and two redox electrons give an S = 1/2 spectrum that produces temperature-dependent line broadening, while the three-electron product, (Ru(bpm)/sub 3/)/sup -/, does not give line broadening. Reduced mixed ligand complexes such as (Ru(bpy)/sub 2/(bpm/sup -/))/sup +/ produced hyperfine structure (hfs) associated with the bpm ligand. The hfs of the one-electron-reduced dimer (Ru(bpy)/sub 2/(bpm/sup -9/)/sup +/ species as well as the hfs of reduced free ligand bpm produces spin densities in the bpm that are consistent with intuition. A comparison of the charge localization and electron-transfer process in these and other mixed valent metal complexes is presented.
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