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Mechanism of 3,4-diarylpyrrole electrooxidation.
Autorzy
Rok wydania
2016
Czasopismo
Numer woluminu
200
Strony
296-304
DOI
10.1016/j.electacta.2016.03.066
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The purpose of this study was to investigate 3,4-diarylpyrrole electropolymerization and simultaneous or subsequent intramolecular oxidative coupling leading to poly(phenanthropyrrole). Small amounts of π-conjugated products were obtained only under the conditions of increased concentration of the monomer and increased rate of potential sweep, which enabled both processes − monomer oxidation and deprotonation of the σ-dimer. The combined electrochemistry, UV-vis-NIR, ESR and TD-DFT results show, that the α,α'-coupling of 3,4-diarylpyrrole derivatives is inhibited by the stability of the σ-dimer dication, inhibition of the deprotonation and the reversal of the σ bond formation resulting in regeneration of the monomer. The addition of pyridine did not result in σ-dimer deprotonation in 2- and 2'-position.
Słowa kluczowe
3,4-Diarylpyrroles, Phenanthropyrroles, Electropolymerization, σ-Dimer, Pyridine
Adres publiczny
http://dx.doi.org/10.1016/j.electacta.2016.03.066
Strona internetowa wydawcy
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