The synthesis of complexes [Ru-II(trpy)(2-imino-4-tert-butylquinone)(Cl)](+) and [Ru-II(trpy)(NIL)(OAc)](+) (where trpy = 2:2',6':2 ''-terpyridyl, NIL = 2-imino-4-tert-butylquinone, 2-imino-4-methylquinone, 2-iminoquinone, 2-imino-4-chloroquinone, 2-imino-5-chloroquinone, 2-imino-4,6-di-tert-butyl-N-phenyl-quinone, 2-imino-4,6-di-tert-butyl-N-(2'-trifluoromethylphenyl)-quinone) is reported. The oxidation states of these complexes, as well as the previously reported [Ru-III(trpy)(2-iminosemiquinone)(Cl)](+) complex, are investigated by spectroscopic, electrochemical and theoretical methods resulting in the latter complex being reassigned as [Ru-II(trpy)(2-iminoquinone)(Cl)](+). Evidence for the presence of two structural isomers was found for all complexes, and crystal structures for both isomers of the [Ru-II(trpy)(2-imino-4-tert-butylquinone)(Cl)]ClO4 complex are reported, as well as for the cis isomer of [Ru-II(trpy)(2-imino-4,6-di-tert-butyl-N-phenyl-quinone)(OAc)]PF6. Redox control is also demonstrated based on the Hammett parameters of the substituents on the 2-iminoquinone ligand.