Noninnocence of Indigo: Dehydroindigo Anions as Bridging Electron-Donor Ligands in Diruthenium Complexes. Inorganic Chemistry, (55)6:3105--3116, 2016. [PUMA: complex;ruthenium crystal dehydroindigo dinuclear electrochem electronic mononuclear phenylazopyridine prepn ruthenium spectroelectrochem structure]