Electronic absorption and Raman studies of the radical anion and dianion of a polyene molecule (19,19′,20,20′-tetranor-β,β-carotene)

Jin Yeol Kim, Yukio Furukawa, Mitsuo Tasumi

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Abstract

The electronic absorption and Raman spectra of the radical anion and dianion of 19,19′,20,20′-tetranor-β,β-carotene, a polyene molecule with eleven conjugated C=C bonds, have been studied. The radical anion has an intense absorption at 1.46 eV and a weak absorption at 1.00 eV, while the dianion has an intense absorption at 1.59 eV. The C=C stretching (v1) band of the radical anion is 26 cm-1 lower, whereas the v1 band of the dianion is 15 cm-1 higher, than that of the neutral species. This upshift observed for the dianion suggests large structural changes such as inversion of bond alternation. The CH in-plane-bending (v2) bands of the radical anion and the dianion, both observed at 1275 cm-1, are 15 cm-1 lower than that of the neutral species and may be used as a marker of negatively charged polyenes.

Original languageEnglish
Pages (from-to)418-422
Number of pages5
JournalChemical Physics Letters
Volume276
Issue number5-6
DOIs
Publication statusPublished - 1997 Sep 26

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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