Abstract
Incorporation of π electron-rich dihydropyrene units into the polymer backbone of polythiophene afforded a conducting polymer with narrow bandgap energy of about 1.0eV. Doping of this polymer with iodine showed an optimum conductivity of about 1.0Scm−1. The quinoid character and a small highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO–LUMO) separation in the dihydropyrene are believed to account for the observed semi-conducing properties of this dihydropyrene–thiophene copolymer. The dihydropyrene unit in the copolymer was found to exhibit a significantly higher thermal stability than the parent molecule.
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