Abstract:

The electrolyte solution consisted of 1.5 mol.L~(-1) HCl and 0.2 mol.L~(-1) o-methylaniline was electrolysed at a constant potential by using two pieces of platinum as electrodes, the anodic potential was controlled at 0.4V(vs. SCE). A blue and cohesive film was formed at the anodic electrode, it was poly-o-methylaniline(poly-o-toluidine). Its ESR spectrum was characterized as a single narrowline. When a fresh synthesized poly-o-methylaniline(0.35V) was reduced to -0.22 V(vs.SCE), its conductivity decreased from 5.8×10~(-3) to 3.5×10~(-5) S.cm~(-1), and its peak-to-peak linewidth ΔH_(p-p) increased from 1.94 G to 3.10 G. The film colour changed with the pH values of the solution and its electrode potentials. There are two anodic and two cathodic peaks on the cyclic voltammograms of poly-o-methyl-aniline in the 1.5 mol.L~(-1) ZnCl_2 of pH 1.69, the anodic and cathodic peaks at more positive potentials shift toward the negative potentials with increasing pH values. At pH 3.89, only one anodic peak and one cathodic peak on cyclic voltammograms are remained. The peak potentials and peak currents of poly-o-methylaniline in the different pH values are independent of cycles.