Reactions of 5,6,10-{Cl(Ph₃P)₂Ru}-[5,6,10-(-H)₃-10- H-exo-nido-7,8-C₂B₉H_{8] with bis(diphenylphosphino)methane and 1,2-bis(diphenylphosphino)benzene: specific features}

Specific features of reactions of complex 5,6,10-{Cl(Ph3P)(2)Ru}-[5,6,10-(mu-H)(3)-10-H-exo-nido-7,8-C2B9H8] (1) with 1,2-bis(diphenylphosphino)benzene (dppbz) and bis(diphenylphosphino)methane (dppm) in acetonitrile in the presence of amines were studied. Novel closo-ruthenacarborane complexes containing the metal in a formal oxidation state of +2 were isolated. It was established that the reaction of 1 with dppbz affords a complex containing a coordinated acetonitrile molecule, whereas the reaction with dppm results in a tris(phosphine) complex with strongly sterically shielded ruthenium center. Reactions of the newly obtained compounds with carbon tetrachloride or hydrogen chloride give corresponding 17-electron complexes containing the metal atom in a formal oxidation state of +3. The reversibility of the Ru-II -> Ru-III redox transition in the compounds synthesized was investigated by cyclic voltammetry and the influence of the ligand environment on the values of the corresponding redox potentials was assessed.