Insulation effect of an inclusion complex formed by polyaniline and beta-cyclodextrin in solution

The insulation effect of an inclusion complex formed by polyaniline with em eraldine base as a conducting polymer and beta -cyclodextrin as insulators of cyclic form has been studied using the oxidation by iodine in solution o f N-methyl-2-pyrrolidone. When polyaniline is oxidized by iodine in the sol ution, the solution color changes from blue to violet. We observed little c hange in color at 273 K or a considerable delay of the spectral change at 2 88 K in the solution of the inclusion complex and iodine in contrast to tha t in solution of polyaniline and iodine without beta -cyclodextrin. This su ggests that the conjugated conducting polymer in the inclusion complex Is a lmost completely insulated by the threaded cyclodextrin molecules from the chemical oxidation by iodine and that the oxidation at 288 K proceeds after the inclusion complex dissociates into polyaniline and cyclodextrin in the solution. Copyright (C) 2000 John Wiley & Sons, Ltd.