X-ray structure of polyanilines

Abstract We describe two classes of the emeraldine form of polyaniline, Class I exhibits ES-I crystal structure in the HCl salt form and in the base form it is amorphous EB-I. Class II materials form partially crystalline structures EB-II and ES-II in base and HCl salt forms, respectively. We compare structural results on emeraldine with data for partially crystalline leucoemeraldine base (LEB) and pernigraniline base (PNB) — the fully reduced and oxidized forms of polyaniline, respectively. We contrast our studies of the EB-I/ES-I system with results for poly( o -toluidine) base, POT-EB and hydrochloride, POT-ES.