Raman and infrared studies on trans-copoly(acetylene+acetylene-d 2): Vibrational frequency dispersion and the origin of doping-induced absorptions

Hideo Takeuchi, Yukio Furukawa, Issei Harada, Hideki Shirakawa

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Raman spectra of trans copolymers of acetylene and acetylene-d2 have been measured with various isotopic mixing ratios. From the spectral changes associated with varying isotopic ratio, some criteria have been derived concerning the slopes of vibrational frequency dispersion curves near the zone center and the frequency ranges of dispersion for both (C2H 2)n, and (C2D2)n. Comparison of the criteria with the calculated dispersion curves reported so far shows that the force field for the infinite trans polyene chains should be reexamined. Infrared spectra of iodine-doped copolymers have also been investigated. Upon isotopic mixing, the infrared bands characteristic of doped polyacetylene behave quite differently from the Raman bands of pristine polyacetylene. This finding indicates that the doping-induced infrared absorptions cannot be correlated simply with the Raman-active vibrations in the unperturbed polyene chain. The behavior of the infrared bands is qualitatively accounted for by assuming a charged domain consisting of several or more consecutive monomer units for which the force field is severely affected by the charge transfer reaction with a dopant.

Original languageEnglish
Pages (from-to)2925-2930
Number of pages6
JournalThe Journal of chemical physics
Volume80
Issue number6
Publication statusPublished - 1983
Externally publishedYes

Fingerprint

Acetylene
Vibrational spectra
Polyacetylenes
acetylene
Polyenes
polyacetylene
Doping (additives)
Infrared radiation
field theory (physics)
copolymers
Copolymers
Infrared absorption
curves
mixing ratios
Iodine
infrared absorption
iodine
Charge transfer
Raman scattering
infrared spectra

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Raman and infrared studies on trans-copoly(acetylene+acetylene-d 2) : Vibrational frequency dispersion and the origin of doping-induced absorptions. / Takeuchi, Hideo; Furukawa, Yukio; Harada, Issei; Shirakawa, Hideki.

In: The Journal of chemical physics, Vol. 80, No. 6, 1983, p. 2925-2930.

Research output: Contribution to journalArticle

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AB - Raman spectra of trans copolymers of acetylene and acetylene-d2 have been measured with various isotopic mixing ratios. From the spectral changes associated with varying isotopic ratio, some criteria have been derived concerning the slopes of vibrational frequency dispersion curves near the zone center and the frequency ranges of dispersion for both (C2H 2)n, and (C2D2)n. Comparison of the criteria with the calculated dispersion curves reported so far shows that the force field for the infinite trans polyene chains should be reexamined. Infrared spectra of iodine-doped copolymers have also been investigated. Upon isotopic mixing, the infrared bands characteristic of doped polyacetylene behave quite differently from the Raman bands of pristine polyacetylene. This finding indicates that the doping-induced infrared absorptions cannot be correlated simply with the Raman-active vibrations in the unperturbed polyene chain. The behavior of the infrared bands is qualitatively accounted for by assuming a charged domain consisting of several or more consecutive monomer units for which the force field is severely affected by the charge transfer reaction with a dopant.

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