When Is an Odd-Electron Dinuclear Complex a Mixed-Valent Species? Tuning of Ligand-to-Metal Spin Shifts in Diruthenium(III,II) Complexes of Noninnocent Bridging Ligands OC(R)NNC(R)O. Inorganic Chemistry, (34)7:1924--1933, 1995. [PUMA: azodicarbonyl complex complex;electron complex;mixed complex;substituent configuration dinuclear effect electrochem ruthenium valence]