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Novel oxoruthenium(IV) complexes of the form [(bpy)(biq)(O)(PR3)RuIV] (C104)2 (where bpy = 2,2'-bipyridine, biq = 2,2'biquinoline, and PR3 = a tertiary phosphine ligand) have been generated through the oxidation of the analogous aquoruthenium(II) species. Characterization of the oxoruthenium(IV), aquoruthenium(II), and chlororuthenium(II) complexes was accomplished through the following methods: IR spectroscopy, cyclic voltammetry, constant-potential coulometry, and UV-visible spectroscopy. The chlororuthenium(II) complex was also characterized by 13C NMR spectroscopy. Aqueous cyclic voltammetric measurements of the aquoruthenium(II) and oxoruthenium(IV) complexes are consistent with a mechanism involving two concomitant oneelectron, one-proton transfers: Rulv(0)/Rum(0H)/Run(OH2). The oxoruthenium(IV) complexes act as oxidants toward organic substrates, where the 2,2'-biquinoline ligand has a clear effect on the kinetics of substrate oxidation.