Methoxy-sexithiophene derivative with two ferrocenyl terminal groups was prepared as a model compound for molecular wires. The oxidation process and the oxidized states of the model compound were investigated by cyclic voltammetry, coulometry, and electronic absorption spectroscopy. The first oxidation occurs in a ferrocene moiety, terminal, and the resultant oxidized species strongly interacts not only with the methoxy-sexithiophene moiety, but also with the other ferrocene.