CHARGE-TRANSPORT AND ELECTRON LOCALIZATION IN POLYANILINE DERIVATIVES

Electrical conductivity, magnetic susceptibility, and electron-spin-re sonance studies are reported in polyaniline and its derivatives poly(o -toluidine), poly(o-ethylaniline), and poly(o-propylaniline). It is sh own that substituents on the C6 rings of the polymer backbone lead to decreased conductivity, decreased Pauli susceptibility, and an increas ed number of Curie spins. Also reflecting these features are electron- spin-resonance line shapes, which transform from Lorentzian for polyan iline toward Gaussian for poly(o-propylaniline). These results are int erpreted in terms of increased electron localization caused by increas ed interchain disorder. Furthermore, evidence of electron-electron cor relations is presented for poly(o-propylaniline).