Polyacetylene and Highly Conducting Charge Transfer Complexes

Abstract
X-ray diffraction, Raman spectroscopy, and x-ray photoemission measurements indicate that the metallic conductivity of iodine-doped polyacetylene results from the intercalation of iodine between close-packed planes of the parent phase to form a charge transfer complex. The polyacetylene chains donate charge to produce I3 and a second iodine species with lower charge density, most likely I5. The structure of this charge transfer complex can be viewed as a perturbation of the structure of the parent polymer, which has been derived from x-ray diffraction analysis and lattice energy calculations.

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