INFRARED AND RAMAN-STUDY OF POLYANILINE .1. HYDROGEN-BONDING AND ELECTRONIC MOBILITY IN EMERALDINE SALTS

Infrared and Raman spectra of chemically prepared (doped) protonated f orms of polyaniline and its deuterated ND and -C6D4- derivatives have been examined. Broad infrared absorption centered near 1100 cm(-1) and cut by numerous Evans holes has been observed and interpreted as an N H stretching band of a strong asymmetric interchain NH+...N hydrogen b ond (d(N-N) approximate to 2.5 Angstrom). Evans holes, which have corr esponding Raman bands, have been assigned to various benzenic and semi quinoidal vibrations. A model of highly conducting polyaniline taking into account the proton transfer is proposed and discussed. The invers ion of the NH+...N hydrogen bond leads to interchain conversions which can generate charge carriers.