IR RESPONSE OF POLY(O-TOLUIDINE) - SPECTRAL MODIFICATIONS UPON REDOX STATE CHANGE

The IR spectra of poly(o-toluidine) in the reduced, half and fully oxi dized states have been studied in both salt and base forms. The bands in the range 1500 to 1600 cm(-1) undergo important intensity changes a s the degree of oxidation increases. The IR spectra show that during t he electrochemical polymerization there is an influence of the nature of the anion present in the electrolyte. This shows up as conformation al differences in the polymer backbone, but it does not affect the che mical structure. Also, spectral changes are observed when the polymer is oxidized in supporting electrolytes containing different anions. Th is has been interpreted by considering that the less hydrated anions c an approach closer to the positive centres of the protonated amine gro ups.