Simultaneous EPR and electrochemical measurements on polyaniline in ambient temperature molten salts

Simultaneous electrochemical measurements and EPR are carried out on polyaniline in ambient temperature molten salts. Maximum EPR response was where half the total observed charge had been passed in both cyclic voltametry and potential step experiments. The number of spins observed and electrons removed were 1:1 to about 25% of full oxidation. Two unresolved one-electron steps are used to explain the experiments with neutral, polaron, and bipolaron thermodynamic equilibrium. Reduced and oxidized form equilibrium constants change with the film`s ionic environment and conductivity. Doping stage dominance and EPR decay response of the polaron are also determined. 32 refs., 10 figs.