SN-CONDUCTING POLYMERS WITH HETEROCYCLIC SPACER GROUPS

Polymer-containing alternating sulfur nitrogen moieties separated by heterocyclic groups have been synthesized and characterized. The polymers have undoped conductivities of 10** minus **6 to 10** minus **9 ( OMEGA cm)**1; the intrinsic carriers are negatively charged as shown by thermopower coefficient of minus 1. 4 multiplied by 10**3 to minus 1. 9 multiplied by 10**3 mu V K** minus **1. The polymers are degraded by AsF//5 and cannot be doped by iodine. Exposure to bromine resulted in reversible p-doping of the SN polymers to the thermopower values of plus 400 to plus 820 mu V K** minus **1 and conductivities of 0. 01 to 0. 002 ( OMEGA cm)** minus **1. Removal of dopant by evacuation returns most of the properties of the polymers to the undoped states. Magnetic properties of the materials have been studied.