Moessbauer spectroscopic study of iodine-doped polyacetylene

The Moessbauer spectroscopy has been applied to iodine-doped polyacetylene employing 129I. It is found that the polymer films contain I-, I3- and I5- with symmetrical charge population, where the content of each iodide anion depends on the doping level. Under dynamic evacuation, it is elucidated that I5- converts to I3- by the elimination of I2- from I5-. 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. (author)