Resonance Raman characterization of polarons and bipolarons in sodium-doped poly(p-phenylenevinylene)

Akira Sakamoto, Yukio Furukawa, Mitsuo Tasumi

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Abstract

The resonance Raman spectra of sodium-doped poly(p-phenylenevinylene) (PPV) and the radical anions and dianions of three model compounds CH3(C6H4CH=CH)nC6H 4CH3 (PVn, n = 1-3) have been studied. The Raman spectra of sodium-doped PPV show marked changes with laser wavelengths used for Raman excitation. These spectra have been analyzed on the basis of the resonance Raman spectra of the radical anions and dianions of the model compounds, which correspond, respectively, to negative polarons and bipolarons in PPV. Three kinds of negative polarons whose lengths are close to PV1, PV2, and PV3, and a bipolaron which is localized in a region close to PV3, exist in a sodium-doped PPV film. Upon prolonged heat treatment of the sodium-doped PPV (290°C, 12 h), the shortest polaron corresponding to the radical anion of PV1 disappears, probably because it combines with another polaron to form a bipolaron. These results indicate that resonance Raman spectroscopy is a powerful tool for characterizing polarons and bipolarons in conducting polymers.

Original languageEnglish
Pages (from-to)3870-3874
Number of pages5
JournalJournal of Physical Chemistry
Volume96
Issue number9
Publication statusPublished - 1992
Externally publishedYes

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Polarons
polarons
Sodium
sodium
Anions
Raman scattering
Gene Conversion
Negative ions
Raman spectra
anions
Conducting polymers
conducting polymers
Raman spectroscopy
heat treatment
Heat treatment
methylidyne
Wavelength
poly(4-phenylenevinylene)
Lasers
wavelengths

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Resonance Raman characterization of polarons and bipolarons in sodium-doped poly(p-phenylenevinylene). / Sakamoto, Akira; Furukawa, Yukio; Tasumi, Mitsuo.

In: Journal of Physical Chemistry, Vol. 96, No. 9, 1992, p. 3870-3874.

Research output: Contribution to journalArticle

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N2 - The resonance Raman spectra of sodium-doped poly(p-phenylenevinylene) (PPV) and the radical anions and dianions of three model compounds CH3(C6H4CH=CH)nC6H 4CH3 (PVn, n = 1-3) have been studied. The Raman spectra of sodium-doped PPV show marked changes with laser wavelengths used for Raman excitation. These spectra have been analyzed on the basis of the resonance Raman spectra of the radical anions and dianions of the model compounds, which correspond, respectively, to negative polarons and bipolarons in PPV. Three kinds of negative polarons whose lengths are close to PV1, PV2, and PV3, and a bipolaron which is localized in a region close to PV3, exist in a sodium-doped PPV film. Upon prolonged heat treatment of the sodium-doped PPV (290°C, 12 h), the shortest polaron corresponding to the radical anion of PV1 disappears, probably because it combines with another polaron to form a bipolaron. These results indicate that resonance Raman spectroscopy is a powerful tool for characterizing polarons and bipolarons in conducting polymers.

AB - The resonance Raman spectra of sodium-doped poly(p-phenylenevinylene) (PPV) and the radical anions and dianions of three model compounds CH3(C6H4CH=CH)nC6H 4CH3 (PVn, n = 1-3) have been studied. The Raman spectra of sodium-doped PPV show marked changes with laser wavelengths used for Raman excitation. These spectra have been analyzed on the basis of the resonance Raman spectra of the radical anions and dianions of the model compounds, which correspond, respectively, to negative polarons and bipolarons in PPV. Three kinds of negative polarons whose lengths are close to PV1, PV2, and PV3, and a bipolaron which is localized in a region close to PV3, exist in a sodium-doped PPV film. Upon prolonged heat treatment of the sodium-doped PPV (290°C, 12 h), the shortest polaron corresponding to the radical anion of PV1 disappears, probably because it combines with another polaron to form a bipolaron. These results indicate that resonance Raman spectroscopy is a powerful tool for characterizing polarons and bipolarons in conducting polymers.

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