The redox properties of a photochromic dinuclear molybdenum Complex, [Mo-2(mu-S-2)(mu-S2C2Ph2)(2)(SC2C2Ph2)(2)] (1), were examined. Conventional and thin-layer cyclic voltammetric measurements showed that 1 undergoes two-electron reduction followed by chemical reactions to give [Mo-2(mu-S)(2)(S2C2Ph2)(4)](2-) which was structurally characterized by X-ray crystallography. The overall two-electron oxidation product of 2 was converted to 1 via formation of four bonds.