Electron paramagnetic resonance and proton nuclear magnetic resonance relaxations in polyanilines

Magnetic resonance measurements, including nuclear magnetic resonance T-1 and T-1 rho and electron paramagnetic resonance T-1e and T-2e relaxation times are presented for polyanilines prepared according to a modification of the conventional synthesis and doping methods, showing a conductivity higher than that of standard HCl-polyaniline polymers. The results, obtained as a function of the doping rate, are interpreted in terms of one-dimensional diffusive motions of spin and charge carriers. High anisotropy in the spin diffusion rate is found. In the framework of the model of single metallic polymer chains, this leads to the conclusion that in our polyanilines the mechanism of conduction is more markedly one-dimensional.