OPTICAL AND VIBRATIONAL-SPECTRA OF SOLS SOLUTIONS OF POLYANILINE - WATER AS SECONDARY DOPANT/

The nature of polyaniline (2A or 2S form) dissolved in concentrated su lfuric and methanesulfonic acid has been investigated by (UV-Vis-NIR) optical absorption and Raman scattering using various exciting laser l ines. Two different polaronic species have been evidenced and selectiv ely analysed, using N-15 labelled and perdeuterated ring derivatives. Addition of water induces formation of 2S-like materials, probably for ming a sol and not a true solution. The achievement of the metallic st ate seems to be related to the ordering of the chains intercalated wit h water, oxonium ions and anions.