NEW CONDUCTING POLYMERS - PF6-DOPED XYZ-TRIHETEROCYCLES BASED ON X,Y, Z= THIOPHENE, FURAN AND N-METHYLPYRROLE

A number of triheterocycles XYZ, where X, Y, Z = furan (0), thiophene (S), or N-methylpyrrole (N) were prepared, and the polymers, obtained by oxidizing them with NOPF6, were studied by four-probe DC conductivity and EPR. SSS has a conductivity of 2.4 S cm-1 at room temperature, and 0.0075 spin/triheterocycle, while SOS has a conductivity of 0.2 S cm-1 and 0. 15 spins/triheterocycle; both have narrow Lorentzian EPR lineshapes. The other samples had conductivities below the measurement threshold (10(-5) S cm-1). We postulate that NOPF 6 overoxidized the polymers, thereby creating more bipolarons than polarons, and reducing the number of charge carriers.