Abstract

We investigated the electron paramagnetic resonance (EPR) spectra of undoped, FeCl 3- and iodine-doped poly( para-phenylene) (PPP) prepared by the method of Kovacic. EPR measurements are used to characterize electronic states relevant for carrier transport in doped PPP. We found a novel dependence of room temperature linewidth ( ΔH pp) and spin density ( N spin) on the dopant concentrations for iodine-doped PPP, namely, ΔH pp first decreased and increased, and then decreased and increased again with increasing iodine concentration in the iodine-doped PPP. The corresponding value of N spin first increased and decreased, and then increased and decreased again with increasing iodine concentration in PPP. However, the changes in ΔH pp with FeCl 3 concentration in FeCl 3-doped PPP differ from those of iodine-doped PPP. We explain the different EPR properties in FeCl 3-doped and iodine-doped PPP.

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