Multistep redox sequences of azopyridyl (L) bridged reaction centers in stable radical complex ions (μ-L)MCl(η5-C5Me5)2$\surd$+, M = Rh or Ir: Spectroelectrochemistry and high-frequency EPR spectroscopy. Dalton Transactions, 17:3370--3375, 2003. [PUMA: ESR ion radical electrochem azopyrimidinyl prepn;radical cation iridium azopyrimidine pentamethylcyclopentadienyl cyclopentadienyl bridged;spectro bridged rhodium azopyridyl]