Mono- and dinuclear maleonitriledithiolate and dibenzyldithiomaleonitrile complexes of (bipy)2RuII: Synthesis, spectral and electrochemical study
作者:Rajendra Prasad
DOI:10.1016/0277-5387(95)00008-g
日期:1995.8
[Ru(bipy)(2)S2C2(CN)(2)}] and [Ru(bipy)(2)(C6H5CH2)(2)S2C2(CN)(2)}][PF6](2) were synthesized by the reaction of [Ru(bipy)(2)Cl-2] . 2H(2)O with Na2S2C2(CN)(2) or (C6H5CH2)(2) S2C2(CN)(2) in aqueous ethanol, and used to form dinuclear species by binding Cp(PPh(3))(2)Ru-II or (bipy)(2)ClRuII moieties onto the CN nitrogen sites. Spectral and electrochemical properties of all complexes have been investigated. S2C2(CN)(2)(2-) is found to introduce a low lying d pi(Ru) --> pi*(S2C2(CN)(2)(2-)) MLCT state and an easily oxidizable centre upon complexation. (C6H5CH2)(2)S2C2(CN)(2) exhibits weaker pi acidity and imparts a 2852 cm(-1), 0.35 V lower stabilization to the ruthenium d pi orbitals than the saturated chain dithioether (CH3)(2)S2C2H2, as indicated in the Ru --> bipy MLCT absorption energy and the first oxidation potential of the corresponding (bipy)(2)Ru-II complexes.