Electropolymerization and spectroelectrochemical characterization of poly(1,5-diaminonaphthalene)

Abstract

1,5-Diaminonaphthalene has been polymerized at glassy carbon and platinum electrodes in 0.1 M HCL and acetonitrile solutions by potential cycling methods. The polymer film grown on the platinum electrode in an aqueous solution had a conductivity of ∼ 1 × 10 −5 S/cm. The number of electrons used for the polymerization reaction was found to be about 4 per mole of the monomer from coulometric experiments. The polymer structure, in which monomers are postulated to be linked to each other through 1- and 5- positions of naphthalene, was consistent with the infrared spectroscopic data of the polymer and coulometric data for the polymerization reaction. When the polymer film is oxidized in 0.10 M HCL, the band of 350 nm undergoes a blue shift to about 290 nm with its reduced absorption and a new band shows up at 580 nm with its absorption extending to wavelengths longer than 800 nm.