Electrochemistry and spectroelectrochemistry (EPR, UV-visible-near-IR) of platinum(II) 2,2'-bipyridine and ring-metalated bipyridine complexes: PtII(L-) and PtI(L-) but not PtI(L). Inorganic Chemistry, (31)24:5084--5088, 1992. [PUMA: ESR;platinum UV bipyridine complex dimethylbipyridine elec electrochem electroredn;dimethylaminobipyridine phenathroline platinum potential;redn pyridine redox reversible spectrum;diaminoethane]