New conducting polymers: PF6-doped XYZ-triheterocycles based on X, Y, Z= thiophene, furan and n-methylpyrrole (original) (raw)

A number of triheterocycles XYZ, where X, Y, Z = furan (O), thiophene (S), or N-methylpyrrole (N) were prepared, and the polymers, obtained by oxidizing them with NOPF 6, 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 threshhoid (10 -5 S cm-t). We postulate that NOPF 6 overoxidized the polymers, thereby creating more bipolarons than polarons, and reducing the number of charge carriers. X, Y, Z = O, $, N(Me)

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