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Titolo:
INSIGHTS INTO THE POLYMERIZATION KINETICS OF SOME ALPHA-SILYLATED THIOPHENE OLIGOMERS
Autore:
HAPIOT P; GAILLON L; AUDEBERT P; MOREAU JJE; LEREPORTE JP; MAN MWC;
Indirizzi:
UNIV PARIS 07,CNRS,URA 438,ELECTROCHIM MOL LAB,2 PL JUSSIEU F-75251 PARIS 05 FRANCE UNIV FRANCHE COMTE,LAB CHIM & ELECTROCHIM MOL F-25030 BESANCON FRANCE UNIV MONTPELLIER 2,CNRS,UA 1097 F-30095 MONTPELLIER 5 FRANCE
Titolo Testata:
Journal of electroanalytical chemistry [1992]
fascicolo: 1-2, volume: 435, anno: 1997,
pagine: 85 - 94
Fonte:
ISI
Lingua:
ENG
Soggetto:
END-CAPPED OLIGOTHIOPHENES; LINEAR SWEEP VOLTAMMETRY; CYCLIC VOLTAMMETRY; CATION RADICALS; ELECTROCHEMICAL POLYMERIZATION; POLYTHIOPHENE MODELS; CRYSTAL-STRUCTURE; OXIDATION; DIMERIZATION; PYRROLES;
Keywords:
THIOPHENE OLIGOMERS; ALPHA-SILYLATION; POLYMERIZATION; CYCLIC VOLTAMMETRY; KINETICS;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
57
Recensione:
Indirizzi per estratti:
Citazione:
P. Hapiot et al., "INSIGHTS INTO THE POLYMERIZATION KINETICS OF SOME ALPHA-SILYLATED THIOPHENE OLIGOMERS", Journal of electroanalytical chemistry [1992], 435(1-2), 1997, pp. 85-94

Abstract

Oxidation of several silylthiophene oligomers has been studied in dichloromethane and acetonitrile by cyclic voltammetry. Detailed mechanistic studies show that the oxidative coupling of silyloligothiophenes involves the carbon-carbon bond formation between two cation-radicals, as previously observed for other non-silylated oligothiophenes. The lifetimes of the cation-radicals are found to be dependent on the solvent, indicating a nucleophilic assistance to the C-Si cleavage. This behavior is in agreement with a reversible coupling step leading to the formation of a dimeric cation followed by the irreversible cleavage of the C-Si bond. Evidence for the existence of an equilibrium between the monomeric cation-radical and an associated form (pi-dimerization) has been obtained from the variation of the redox potential with the temperature and concentration for the most stable cation-radical. (C) 1997 Elsevier Science S.A.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 20:22:54