SYNTHESIS, ELECTRICAL-CONDUCTIVITY AND ELECTRON-PARAMAGNETIC-RESONANCE SPECTROSCOPY OF POLYMERS DERIVED FROM NOPF6-DOPED XYZ-TRIHETEROCYCLES BASED ON PYRROLE, FURAN AND THIOPHENE

A series of triheterocycles; [GRAPHICS] for X, Y, Z = 000, SSS, SOS, S SO, OSO, SOO, O(N-Me)O, S(N-Me)O and S(N-Me)S have been synthesised; o f these O(N-Me)O, SOO and S(N-Me)O are new. The triheterocycles were c hemically polymerised and oxidised with NOPF6. Only the polymers deriv ed from SSS, SOS and SSO show appreciable conductivities. EPR studies indicate the presence of polarons in SSS, SOS, SSO and, at lower conce ntrations, in OOO. All the samples appear to show an easily saturable EPR signal assigned to localised radicals. In OSO, SOO, O(N-Me)O, S(N- Me)O and S(N-Me)S this signal displays considerable asymmetry, and g-v alues significantly above the free electron value. S(N-Me)S shows a hi gher g-value consistent with a loss of planarity.