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

Ir(η⁵-C₅Me₅)(C₃S₅)] C₃S₅²⁻ = 4,5-disulfanyl-1,3-dithiole-2-thionate(2−)] was prepared by a reaction of NMe₄]₂C₃S₅] 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.