Abstract
The results of an extensive X-ray and synchrotron radiation diffraction study of the structure of cis- and trans-polyacetylene doped with iodine are presented. Studies of rapidly and slowly iodine-doped samples confirmed that undoped regions of (CH) x remain. The undoped regions of the initially cis-(CH) x are shown to isomerize to the trans-(CH) x structure during the doping process. Two new previously unreported X-ray reflections have been recorded for both doped cis- and doped trans-isomers. The data are in agreement with the model of intercalation of iodine between planes of close-packed polyacetylene chains.
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