Stable binuclear o- and p-semiquinone complexes of Ru(bpy)22+. Radical ion versus mixed-valence dimer formulation. Journal of the American Chemical Society, (111)5:1733--1738, 1989. [PUMA: bipyridine configuration electrochem redox ruthenium semiquinone semiquinone;ESR semiquinone;UV semiquinone;electron semiquinone;phenanthrolinesemidione semiquinone;phosphinobenzosemiquinone]