Structural Study of Polyacetylene Doped with Tetrahedral Anions

A structural study of polyacetylene doped with CIO4, FeCI4, FeBr4, GaCI4 and lnCI4 tetrahedral anions is presented. First stage intercalated CH/dopant structures are found. At doping levels where electronic properties change considerably, the dopants are found to cluster. Special attention has been paid to characterize the disorder and the amount of cis-trans isomerization in the undoped parts of the films. A relationship between these structural features and the presence of dopant induced elastic constraints is suggested.