Properties of chiral polyaniline in various oxidation states

Optically active polyaniline has been prepared as the conducting emeraldine salts PAn.(+)-HCSA and PAn.(-)-HCSA (HCSA = camphorsulphonic acid). We now report the preparation and chiroptical properties of optically active poly aniline in the following redox and pH states: leucoemeraldine base, emerald ine base, pernigraniline base and pernigraniline salt. These new chiral mat erials were obtained via the chemical reduction or oxidation of optically a ctive PAn.(+)-HCSA or via de-doping with NH4OH. The reversible generation o f these novel optically active materials is of significance for potential a pplications.