Raman studies on the self-localized excitations in lightly and heavily doped trans-polyacetylene with sodium

Jin Yeol Kim, Yukio Furukawa, Akira Sakamoto, Mitsuo Tasumi

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The difference of Raman spectra between lightly and heavily Na-doped trans-polyacetylene (trans-PA) was observed with the 1320 nm laser line, and these were discussed on the basis of the Raman spectra of the negatively charged anions Ph(CH)nPh- [DPn -, n = 3, 5, 7, 9, and 13] and the radical-anion species Ph(CH)nPh.- [DPn .-, n = 4, 6, 8, and 10] and 19,19′,20,20′-tetranor-β,β′-carotene [TNBC.-, n = 22] of the model compounds, which correspond respectively to negatively charged soliton and negative polarons in trans-PA. The observed wavenumbers of the v1 and v4 bands (C=C and C-C stretches) of lightly doped trans-PA are lower than those of the corresponding bands of pristine trans-PA, whereas the contrary is the case for heavily doped trans-PA. Raman spectra of the negatively charged soliton models (DPn -) and the negative polaron models (DPn .- and TNBC.-) were very similar to their spectrum patterns as a whole, but their wavenumbers and relative intensifies are mutually different to some extent. In particular, the Raman wavenumbers of heavily doped trans-PA are very similar with those of the polaron models. The dispersion of the C=C stretching band (ν1) in doped PA with the various wavelengths of excitation laser line were explained as the presence of charged domains having various lengths of electron localization.

    Original languageEnglish
    Pages (from-to)8876-8882
    Number of pages7
    JournalJournal of Physical Chemistry A
    Volume106
    Issue number38
    DOIs
    Publication statusPublished - 2002 Sep 26

    Fingerprint

    Polyacetylenes
    self excitation
    polyacetylene
    Sodium
    sodium
    Raman scattering
    Gene Conversion
    Raman spectra
    Solitons
    Anions
    solitary waves
    methylidyne
    anions
    carotene
    Polarons
    Laser excitation
    polarons
    Carotenoids
    Stretching
    lasers

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry

    Cite this

    Raman studies on the self-localized excitations in lightly and heavily doped trans-polyacetylene with sodium. / Kim, Jin Yeol; Furukawa, Yukio; Sakamoto, Akira; Tasumi, Mitsuo.

    In: Journal of Physical Chemistry A, Vol. 106, No. 38, 26.09.2002, p. 8876-8882.

    Research output: Contribution to journalArticle

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