Poly(o-methylaniline) (I) was doped by some protonic acids. The acidity, mol. size and oxidizing ability of protonic acids affected the doping level and conductivity of polymer obtained to some extent. The organic acids with large mol. size could induce the solubility of doped I. The protonic acid-doping led to the rearrangement of the electron in the nitrogen atom and the phase-sepn. of polymer due to the inhomogeneous distribution of dopant. The conduction of HClO4-doped I was predominantly electronic and its charge carrier was unpaired electron or radical cation.

Key words: DOPE, CONDUCTING POLYMER, BRONSTED ACID