The synthesis of complexes [RuIItrpy)(2-imino-4-tert- butylquinone)(Cl)]+ and [Ru11(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 [Ru111(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 [RuII(trpy)(2-imino-4-tetr-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)]PF 6. Redox control is also demonstrated based on the Hammett parameters of the substituents on the 2-iminoquinone ligand.
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