Sensitive Oxidation State Ambivalence in Unsymmetrical Three-Center (M/Q/M) Systems (acac)2Ru(m-Q)Ru(acac)2n, Q = 1,10-Phenanthroline-5,6-dione or 1,10-Phenanthroline-5,6-diimine (n = +, 0, -, 2-). Inorganic Chemistry, (44)9:3210--3214, 2005. [PUMA: EPR complex dinuclear oxidn phenanthrolinediimine phenanthrolinediimine;ruthenium phenanthrolinedione prepn ruthenium spectroelectrochem state unsym]