Effect of metal exchange (Os vs. Ru) and co-ligand variation (Cl- vs. acac-) on the oxidation state distribution in complexes of an o-phenylenediamido(2-)/o-quinonediimine redox system. Dalton Transactions, 37:7778--7785, 2009. [PUMA: complex complex;ESR complex;electronic complex;electrooxidn complex;electroredn complex;geometry complex;osmium complex;valence crystal optimized osmium prepn prepn;UV quinonediimine ruthenium structure structure;ruthenium visible]