In situ UV–vis and FTIR attenuated total reflectance studies on the electrochemically synthesized copolymer from biphenyl and 3-octylthiophene

Rose-Marie Latonen, Carita Kvarnström*, Ari Ivaska

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The electrochemical synthesis and redox response of a copolymer consisting of 3-octylthiophene and biphenyl units have been
studied. The polymer material has been characterized by cyclic voltammetry, in situ UV–vis absorption spectroscopy, FTIR
transmission and in situ FTIR attenuated total reflectance spectroscopy. Two different copolymer structures have been obtained
when lithium hexafluoroarsenate and tetrabutylammonium tetrafluoroborate were used as electrolyte salts. The UV–vis absorption
spectra and the IR bands of the neutral copolymer film are compared with the spectra of pure poly(para-phenylene) and
poly(3-octylthiophene). The growth of infrared active vibrations are followed during oxidation of the copolymer film in
monomer-free electrolyte solution and the spectral feature above 2000 cm−1 shows a reversible transformation of the film from
the non-conducting to the conducting form when the copolymer is charged and discharged.
Original languageEnglish
Pages (from-to)36–48
JournalJournal of Electroanalytical Chemistry
Volume512
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

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