Raman spectroscopic characterization of polyselenophenes and poly(3,4-ethylenenedioxyselenophene)s

Cristina Capel Ferrõn, Yana Sheynin, Mao Li, Asit Patra, Michael Bendikov, Juan T. Lõpez Navarrete, Victor Hernández, M. Carmen Ruiz Delgado

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Abstract

Herein we present novel Raman spectroscopic studies carried out for polyselenophene (PSe), poly(3,4-ethylenedioxyselenophene) (PEDOS), and alkyl-substituted poly(alkyl-3,4-ethylenedioxyselenophene) (PEDOS-Cn: n=2, 8, and 12) homologues. These spectroscopic data are combined with morphological and structural analysis techniques, such as AFM, and DFT simulations. An investigation into the extent of π-conjugation in PSe is presented by comparing its spectral signatures with those of a homologous series of oligoselenophenes. Our experimental data suggest that π-conjugation in the PSe backbone extends to more than six selenophene units. The incorporation of ethylenedioxy (EDO) groups in PEDOS results in a more complex spectrum and a downshift of the C-C/C-C stretching vibration (or effective conjugation coordinate (ECC) mode); this provides evidence for an improvement in the π-conjugational properties along the PSe backbone upon EDO substitution. The dispersity of π-conjugation lengths in different PEDOS samples obtained through different synthetic routes is evaluated as a function of different structural factors. Finally, we present experimental evidence that the insertion of alkyl chains into the EDO units slightly impacts on the π-conjugational properties of the PEDOS backbone in the non-annealed samples (with an improved π-electron delocalization found in PEDOS-C8), but moderately affects the degree of molecular order of polymer films upon thermal annealing.

Original languageEnglish
Pages (from-to)759-766
Number of pages8
JournalIsrael Journal of Chemistry
Volume54
Issue number5-6
DOIs
Publication statusPublished - Jun 2014

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Keywords

  • Raman spectroscopy
  • conjugation
  • heterocycles
  • polymers
  • thermochemistry

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Ferrõn, C. C., Sheynin, Y., Li, M., Patra, A., Bendikov, M., Lõpez Navarrete, J. T., Hernández, V., & Ruiz Delgado, M. C. (2014). Raman spectroscopic characterization of polyselenophenes and poly(3,4-ethylenenedioxyselenophene)s. Israel Journal of Chemistry, 54(5-6), 759-766. https://doi.org/10.1002/ijch.201400024