Electron Paramagnetic Resonance and Spectroscopic Characteristics of Electrogenerated Mixed-Valent Systems (h5-C5Me5)M(m-L)M(h5-C5Me5)+ (M = Rh, Ir; L = 2,5-Diiminopyrazines) in Relation to the Radicals (h5-C5Me5)ClM(m-L)MCl(h5-C5Me5)+ and (h5-C5Me5)M(m-L)MCl(h5-C5Me5)2+. Inorganic Chemistry, (39)12:2516--2521, 2000. [PUMA: bpip bxip chloro cyclopentadienyl diiminopyrazine electrochem iridium mixed pentamethylcyclopentadienyl pentamethylcyclopentadienyl;iminoethyl prepn pyrazine redn redn;ESR rhodium valent]