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The first stages of chemical and electrochemical aniline oxidation - spectroscopic comparative study
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SYSNO ASEP 0523939 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The first stages of chemical and electrochemical aniline oxidation - spectroscopic comparative study Author(s) Morávková, Zuzana (UMCH-V) RID, ORCID
Šeděnková, Ivana (UMCH-V) RID
Bober, Patrycja (UMCH-V) RID, ORCID, SAIArticle number 2091 Source Title Applied Sciences-Basel. - : MDPI
Roč. 10, č. 6 (2020), s. 1-20Number of pages 20 s. Language eng - English Country CH - Switzerland Keywords polyaniline ; aniline oligomer ; electrochemistry Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GJ18-01924Y GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000529252800192 EID SCOPUS 85082726747 DOI 10.3390/app10062091 Annotation 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. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2021 Electronic address https://www.mdpi.com/2076-3417/10/6/2091
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