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

The insulation effect of an inclusion complex formed by polyaniline with emeraldine base as a conducting polymer and beta -cyclodextrin as insulators of cyclic form has been studied using the oxidation by iodine in solution of N-methyl-2-pyrrolidone. When polyaniline is oxidized by iodine in the solution, the solution color changes from blue to violet. We observed little change in color at 273 K or a considerable delay of the spectral change at 288 K in the solution of the inclusion complex and iodine in contrast to that in solution of polyaniline and iodine without beta -cyclodextrin. This suggests that the conjugated conducting polymer in the inclusion complex Is almost 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.