In situ Fourier transform infrared attenuated total reflection (FTIR-ATR) spectroscopic investigations on the base-acid transitions of leucoemeraldine
✍ Scribed by Zhao Ping; G.E. Nauer; H. Neugebauer; J. Theiner; A. Neckel
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 611 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
Leucoemeraldine, the reduced form of the polyaniline, was obtained by electrochemical polymerization. Extensive infrared spectroscopic studies are discussed in this work. Ex situ FTIR spectra measured in NaReO,/HReO, electrolytes with different pH-values are presented and the absorption bands are assigned to different vibrational modes. Additionally, a distinct picture of the base-acid transition is evaluated using in sifu FTIR-ATR measurements in electrolytes containing the supporting salts mFb/HPFe, NaC104/HC104 and NaReOd/HReOd. The results demonstrate that in strong acidic media leucoemeraldine nitrogen atoms can be partly protonated. The protonation process starts in the pH-range 2.5 and 3 in the intercalation of anions from the electrolyte into the polymer structure is determined semi-quantitatively.