The first stages of chemical and electrochemical aniline oxidation - spectroscopic comparative study

0523939 - ÚMCH 2021 RIV CH eng J - Journal Article
Morávková, Zuzana - Šeděnková, Ivana - Bober, Patrycja
The first stages of chemical and electrochemical aniline oxidation - spectroscopic comparative study.
Applied Sciences-Basel. Roč. 10, č. 6 (2020), s. 1-20, č. článku 2091. E-ISSN 2076-3417
R&D Projects: GA ČR(CZ) GJ18-01924Y
Institutional support: RVO:61389013
Keywords : polyaniline * aniline oligomer * electrochemistry
OECD category: Polymer science
Impact factor: 2.679, year: 2020
Method of publishing: Open access
https://www.mdpi.com/2076-3417/10/6/2091

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.
Permanent Link: http://hdl.handle.net/11104/0308244