Preparation of non-Kekulé- and nondisjoint-type aromatic polyamines by palladium-catalyzed polycondensation and their poly(cationic radical)s

A series of triarylamine polymers were prepared by palladium-catalyzed polycondensation. Extension of the π-conjugation was analyzed by UV and electrochemical measurements, which revealed the degree of off-coplanarity in the polymer framework. Chemical oxidation of the polymer with NOPF₆ gave the corresponding poly(aminium cationic radical). The ESR signal at room temperature indicated an exchange interaction between the radicals in the polymer. The spectrum recorded at 12 K displayed a ΔM_s = ±2 transition signal at half-field, which was characteristic of multiplet species.