Mossbauer Spectroscopic Study of Iodine-Doped Polyacetylene

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Abstract
The Mössbauer spectroscopy has been applied to iodine-doped polyacetylene employing 129 I. It is found that the polymer films contain I - , I 3 - and I 5 - with symmetrical charge population, where the content of each iodide anion depends on the doping level. Under dynamic evacuation, it is elucidated that I 5 - converts to I 3 - by the elimination of I 2 from I 5 - . The variation of electrical conductivity in iodine-doped polyacetylene is discussed with the mechanism of charge transfer from the polymer and with the mutual conversion of iodide anions.