Oxidation of [Ir(η5-C5Me5)(C3S5)] [C3S52− = 4,5-disulfanyl-1,3-dithiole-2-thionate(2−)] and X-ray crystal structure of [IrBr(η5-C5Me5)(μ-C2S4)IrBr(η5-C5Me5)]

[Ir(η5-C5Me5)(C3S5)] [C3S52− = 4,5-disulfanyl-1,3-dithiole-2-thionate(2−)] was prepared by a reaction of [NMe4]2[C3S5] with [Ir(η5- C5Me5)Cl2]2 in ethanol. It was reacted with bromine to afford a paramagnetic species [IrBr(η5-C5Me5)(C3S5)] with the Ir–Br bond and in the one-electron-oxidized state, and a diamagnetic dinuclear species [IrBr(η5-C5Me5)(μ-C2S4)IrBr(η5-C5Me5)]. ESR spectra for the one-electron-oxidized species in solution are discussed. The X-ray crystal structural analysis for the latter complex revealed the geometry consisting of dinuclear IrBr(η5-C5Me5) moieties bridged by the C2S42− ligand.