The electrochemical oxidation of Ir(tdppcyme)(CO)Cl, tdppcyme = cis,cis-1,3,5-tris(di-phenylphosphine)-cis,cis-1,3,5-tris(methoxycarbonyl)cyclohexane, is investigated in dichloromethane-0.1 M tetrabutylammonium hexafluorophosphate at Pt electrodes with cyclic voltammetry, chronoamperometry and chronocoulometry, as well as preparative electrolysis. While the primary one-electron oxidation to Ir+II appears quasi-reversible in the electroanalytical experiments, the longer time scale of electrolysis allows the formation of an insoluble product by a follow-up reaction. By means of spectroscopic techniques as well as EXAFS and EDX experiments the structure of a dimeric di-mu -chloro di-iridiurn complex is deduced.