In-situ spectroelectrochemical characterization of poly(1,5-diamino-naphthalene)

Summary form only given. 1,5-Diaminonaphthalene has been polymerized on platinum and glassy carbon electrodes - in acetonitrile solutions by potential cycling methods. The polymer films thus prepared have been characterized by electrochemical and in-situ spectroelectrochemical techniques. The polymer film grown on the platinum electrode in an aqueous solution had a conductivity of /spl tilde/ 1 x 10/sup -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 with each other through 1- and 5-positions, was consistent with the infrared spectroscopic data of the polymer and coulometric data for the polymerization reaction. While the polymer shows major absorption peaks at 215 and 300 nm, it has a weak absorption at 525 nm in a 0.10 M HCL solution. When the polymer film is oxidized in 0.10 M HCI, the band at 350 nm undergoes a blue shift to about 290 nm with its absorption reduced and a new absorption band show up at 580 nm with its absorption extending to wavelengths longer than 800 nm. This behavior, which is typical for the system producing bipolarons upon electrochemical doping, is shown more clearly in the difference spectrum.