X.p.s. studies of charge transfer interactions in some polyaniline complexes

Abstract

The imine, amine and positively charged nitrogen in polyaniline at various oxidation states can be quantitatively differentiated in the properly deconvoluted N1s X-ray photoelectron spectroscopy (X.p.s.) core-level spectrum. The structural changes of polyemeraldine base during 'doping' by protonic acid and by proton-free organic acceptors, such as the halobenzoquinones, were compared. X.p.s. results suggest the presence of halogen and benzoquinone anions in the latter complexes. The mechanism of interactions with the organic acceptors was found to be analogous to that of protonation, with the charge transfer interactions occurring preferentially at the imine repeating units. © 1990.