IN-SITU FOURIER-TRANSFORM INFRARED ATTENUATED TOTAL-REFLECTION (FTIR-ATR) SPECTROSCOPIC INVESTIGATIONS ON THE BASE-ACID TRANSITIONS OF DIFFERENT FORMS OF POLYANILINE - BASE-ACID TRANSITION IN THE LEUCOEMERALDINE FORM

Infrared spectroscopic studies on the fully reduced form of polyanilin e are discussed in this work. Ex situ FTIR spectra measured in NaReO4 + HReO4 electrolytes with different pH values are presented, and the a bsorption bands are assigned to different vibrational modes. Additiona lly, a distinct picture of the base-acid transition is evaluated using in situ FTIR-ATR measurements in electrolytes containing the supporti ng salt NaReO4 + HReO4. The results demonstrate that in strong acidic media leucoemeraldine nitrogen atoms can be partly protonated. The pro tonation process starts in the range between pH = 2.5 and 3 and the in tercalation of anions from the electrolyte into the polymer structure is determined semi-quantitatively.