2,5-Dioxido-1,4-benzoquinonediimine (H2L2-), a hydrogen-bonding noninnocent bridging ligand related to aminated topaquinone: Different oxidation state distributions in complexes (bpy)2Ru2(m-H2L)n (n = 0 , +, 2+, 3+, 4+) and (acac)2Ru2(m-H2L)m (m = 2-, -, 0, +, 2+). Chemistry - A European Journal, (11)17:4901--4911, 2005. [PUMA: acac bond bridged bridging charge complex complex;crystal complex;electrochem complex;hydrogen complex;mixed complex;ruthenium dinuclear dioxidobenzoquinonediimine electrochem ligand prepn redox ruthenium structure transfer valence]