Synthesis, spectral and electrochemical aspects of maleonitriledithiolate and dibenzyldithiomaleonitrile complexes of cyclopentadienylruthenium(II)
摘要:
Complexes [RuCp(PPh(3){S2C2(CN)(2)}](-) (1), [Ru(2)Cp(2)(PPh(3))(4){S2C2(CN)(2)}] (2) and [RuCp(PPh(3)){S-2(CH2C6H5)(2)C-2(CN)(2)}](+) (3) have been synthesized by the reaction of [CpRu(PPh(3))(2)Cl] with S2C2(CN)(2)(2-) or (C6H5CH2)(2)S2C2(CN)(2)] in MeOH. The complex [RuCp(PPh(3)){S-2(CH2-C6H5)(2)C-2(CN)(2)}](+) when further reacted with [CpRu(PPh(3))(2)Cl] formed a dinuclear complex [Ru(2)Cp(2)(PPh(3))(3){S-2(CH2C6H5)(2)C-2(CN)(2)}](2+) (4). All these complexes have been characterized by their physical and spectral (IR; H-1 P-31 NMR and visible spectral data. S2C2(CN)(2)(2-) has been found to introduce a low lying MLCT absorption in the electronic spectra of its complexes. In CV scan these complexes exhibit an extended series of one electron transfer reactions. The metal-centred oxidation waves of the complexes have been correlated with the pi acidity of ligands.