Studies on oxidation-reduction reactions of ruthenium ammines

Article abstract of DOI:10.1021/ic50026a001

Kinetic and stoichiometric measurements of the reductions of Ru(NH₃)₆⁺³ by Cr⁺²(aq) (Cl^- independent as well as Cl^- catalyzed paths) and stoichiometries of the reaction of Ru(NH₃)₅Cl⁺² with Cr⁺² are reported. Evidence is presented that the reduced species is in each case a Ru(II) ammine and that the ammine ligands remain in the Ru(II) coordination sphere for reasonable periods of time. The standard oxidation potential of Ru(NH8₃)₆⁺² = Ru(NH₃)₆⁺³ + e^- has been determined as -0.214 v. Further kinetic studies of oxidation of Ru(II) species by ClO₄^- and Co(III) ammines are reported. Equilibrium quotients for the anation of Ru(NH₃)₅OH₂⁺³ by Cl^-, Br^-, and I^- have been determined taking advantage of the catalysis of the reactions by Ru(NH₃)₅OH₂⁺². Copyright 1965 by the American Chemical Society.