Electrochemical and spectroelectrochemical behavior of 3,4 ',4 '',4 '''-tetraoctyl-5 '''-chloro-2,2 ': 5 ',2 '': 5 '',2 '''-quaterthiophene - a shortchain model compound for regioregular poly(3-alkylthiophene)

Citation
M. Lapkowski et al., Electrochemical and spectroelectrochemical behavior of 3,4 ',4 '',4 '''-tetraoctyl-5 '''-chloro-2,2 ': 5 ',2 '': 5 '',2 '''-quaterthiophene - a shortchain model compound for regioregular poly(3-alkylthiophene), J ELEC CHEM, 501(1-2), 2001, pp. 166-172
Citations number
42
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
ISSN journal
15726657 → ACNP
Volume
501
Issue
1-2
Year of publication
2001
Pages
166 - 172
Database
ISI
SICI code
Abstract
Electrochemical and spectroelectrochemical behavior of regioregular monochl orosubstituted tetra(3-octylthiophene) (QT) has been investigated using UV- vis-NIR, EPR and Raman spectroscopies. The results obtained prove that QT u ndergoes dimerization to dichlorosubstituted octa(3-octylthiophene) (OT) an d dynamic EPR spectroelectrochemical experiments combined with cyclic volta mmetry can help to determine the mechanism of the process. UV-vis-NIR measu rements made it possible to find electron spectra of the polaron and bipola ron formed during the oxidation of OT. The suggested mechanism of oxidation and electrohydrodimerization of QT into OT is corroborated by FT Raman spe ctroelectrochemical studies, which show significant changes in the position and intensities of the Raman bands coinciding with the polaronic and bipol aronic structures of the oligomers. These changes can he interpreted in ter ms of formation of a quinoid sequence of bonds in the oxidized oligomers. ( C) 2001 Elsevier Science B.V. All rights reserved.