Electron spin resonance studies of some chemically synthesized polypyrrole complexes

Abstract

Electron spin resonance (e.s.r.) studies were performed on polypyrrole (PPY)-halogen and PPY-organic acceptor complexes obtained from chemical polymerization and oxidation. The linewidth depends strongly on the type of acceptor incorporated. However, no correlation between conductivity and either linewidth or spin concentration was found. The e.s.r. signal can be associated with neutral π-radial defects. The effect of polymeric structural disorder on the localization of unpaired spins was demonstrated in the PPY-Br2 complexes.