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The First Stages of Chemical and Electrochemical Aniline Oxidation—Spectroscopic Comparative Study

Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky Sq. 2, 168 06 Prague, Czech Republic
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Appl. Sci. 2020, 10(6), 2091; https://doi.org/10.3390/app10062091
Received: 20 February 2020 / Revised: 9 March 2020 / Accepted: 12 March 2020 / Published: 19 March 2020
(This article belongs to the Special Issue Spectroscopy of Conducting Polymers)
There are several types of aniline oligomers that can be formed in the early stages of aniline oxidation: linear oligomers with repeating units joined in para positions, and various branched and polycyclic oligomers, being the two most important groups. The fraction of these different oligomeric groups depends upon the reaction conditions of aniline oxidation. The aim of this study was to analyze the first products of the chemical and electrochemical oxidation of aniline at the (starting) pH 1 and 7, in order to specify the conditions of the formation of phenazine-like oligomers, and to test the theory that they have an important role in polyaniline film formation. We have confirmed that phenazine-like oligomers do not form at pH 1, neither in the chemical nor the electrochemical oxidation of aniline; however, they form in both chemical and electrochemical oxidation of aniline at pH 7. Phenazine-like oligomers are thus definitely not necessary intermediates for PANI film formation, not even in the chemical polymerization of aniline. Finally, the redox behavior of phenazine-like oligomers was demonstrated in a medium at pH 1. View Full-Text
Keywords: polyaniline; aniline oligomer; electrochemistry; FTIR; SERS polyaniline; aniline oligomer; electrochemistry; FTIR; SERS
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MDPI and ACS Style

Morávková, Z.; Šeděnková, I.; Bober, P. The First Stages of Chemical and Electrochemical Aniline Oxidation—Spectroscopic Comparative Study. Appl. Sci. 2020, 10, 2091. https://doi.org/10.3390/app10062091

AMA Style

Morávková Z, Šeděnková I, Bober P. The First Stages of Chemical and Electrochemical Aniline Oxidation—Spectroscopic Comparative Study. Applied Sciences. 2020; 10(6):2091. https://doi.org/10.3390/app10062091

Chicago/Turabian Style

Morávková, Zuzana, Ivana Šeděnková, and Patrycja Bober. 2020. "The First Stages of Chemical and Electrochemical Aniline Oxidation—Spectroscopic Comparative Study" Applied Sciences 10, no. 6: 2091. https://doi.org/10.3390/app10062091

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