Vibrational spectroscopic study on partly hydrogenated trans-polyacetylenes

Yukio Furukawa, Tsutomu Arakawa, Hideo Takeuchi, Issei Harada, Hideki Shirakawa

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Raman and infrared spectra have been studied on variously hydrogenated trans-polyacetylenes which are prepared by exposing Na-doped trans-polyacetylene films to ethanol. Raman spectra have been analyzed by reference to the relations between the number of trans-conjugated double bonds (NC=C) and the ν1 and ν3 frequencies. NC=C's of increased short segments are correlated with the distribution of dopants. Information on (CH2)k groups and very short (CH=CH) n groups including isolated (CH=CH) is obtained from infrared spectra and hydrogenation processes are proposed. Upon iodine doping the hydrogenated films exhibit three infrared bands which are similar to the well-known three-band pattern of doped polyacetylene, while they give poor electrical conductivities at the maximum iodine doping. Hence, the three bands of doped polyacetylene do not straightforwardly correlate with the overall conductivity. The infrared results strongly indicate that a relatively short conjugated segment with methylene groups at both terminals can be doped as well as a long polyene and the structure including the force field of the doped part in the segment is similar to that in the long polyene. Importance of intermolecular packing of the doped parts in realizing a high electrical conductivity is pointed out.

Original languageEnglish
Pages (from-to)2907-2914
Number of pages8
JournalThe Journal of chemical physics
Volume81
Issue number7
Publication statusPublished - 1984
Externally publishedYes

Fingerprint

Polyacetylenes
polyacetylene
methylidyne
Infrared radiation
Polyenes
Doping (additives)
Iodine
iodine
infrared spectra
Raman spectra
electrical resistivity
methylene
field theory (physics)
Hydrogenation
hydrogenation
Raman scattering
ethyl alcohol
Ethanol
conductivity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Furukawa, Y., Arakawa, T., Takeuchi, H., Harada, I., & Shirakawa, H. (1984). Vibrational spectroscopic study on partly hydrogenated trans-polyacetylenes. The Journal of chemical physics, 81(7), 2907-2914.

Vibrational spectroscopic study on partly hydrogenated trans-polyacetylenes. / Furukawa, Yukio; Arakawa, Tsutomu; Takeuchi, Hideo; Harada, Issei; Shirakawa, Hideki.

In: The Journal of chemical physics, Vol. 81, No. 7, 1984, p. 2907-2914.

Research output: Contribution to journalArticle

Furukawa, Y, Arakawa, T, Takeuchi, H, Harada, I & Shirakawa, H 1984, 'Vibrational spectroscopic study on partly hydrogenated trans-polyacetylenes', The Journal of chemical physics, vol. 81, no. 7, pp. 2907-2914.
Furukawa, Yukio ; Arakawa, Tsutomu ; Takeuchi, Hideo ; Harada, Issei ; Shirakawa, Hideki. / Vibrational spectroscopic study on partly hydrogenated trans-polyacetylenes. In: The Journal of chemical physics. 1984 ; Vol. 81, No. 7. pp. 2907-2914.
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