The oxidation of 1,3-dimethoxybenzene on a platinum electrode, in different electrolytic media, has been investigated using in situ Fourier transform infrared spectroscopy (FTIR). These studies shed light on the mechanisms of electroxidative polymerisations of 1,3-dimethoxybenzene and the subsequent formation of a polymeric film on the surface of the platinum electrode. Vibrations from doping anions as well as the corresponding cations of the electrolyte salt were observed in the spectra obtained. Evidence of adsorption of monomer and the formation of nBU(4)NBF(4)-CH3CN adduct are also reported. (C) 2003 Published by Elsevier B.V.