Electropolymerization of 2-methoxy aniline. Electrochemical and spectroscopical product characterization

Poly(2-methoxyaniline) (PMOA) was electrosynthesized with varying monomer c oncentrations in 1 M HClO4. The polymers obtained were characterized using cyclic voltammetry, Fourier transform IR diffuse reflectance spectroscopy ( FTIR-DRS), W-vis spectroscopy and electrochemical impedance. At relatively high monomer concentrations (>20 mM), the polymer obtained is similar to ar yl amine conducting polymers, but shows in its voltammogram an intermediate peak, which becomes larger as the monomer concentration decreases. For mon omer concentrations below similar to 20 mM, the polymer becomes more resist ive, behaving similarly to aryl amine redox polymers. The different techniq ues employed show results consistent with the voltammetric experiments. Thi s change of behaviour indicates that different polymers are obtained as the monomer concentration is modified. (C) 1999 Elsevier Science S.A. All righ ts reserved.