EPR study of electron transfer and group transfer in organoplatinum(II) and (IV) compounds. Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry, 12:2573--2577, 1997. [PUMA: photochem chelate radical electrochem redn chelate;electron diazabutadiene;methyl transfer anion;ESR 4 platinum organoplatinum radical;photohomolysis methyl diazabutadiene chelate;homolysis group mesityl diazabutadiene;platinum]