Raman spectra and electronic structure of alkaline metal doped polyacetylene and .BETA.-carotene.
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概要
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Raman spectra of alkaline metal doped polyacetylene were studied at various levels of doping for (CHM<I><SUB>y</SUB></I>)<I><SUB>x</SUB></I>, and (CDM<I><SUB>y</SUB></I>)<I><SUB>x</SUB></I>, M=Na and K, with <I>y</I>=0–0.18. Several steps in the doping process can be recognized in changes of the Raman spectra; the initial Raman lines remain for <I>y</I>=0–0.06 but change completely into a new pattern at <I>y</I>=0.13. Raman and ESR spectra of alkaline metal doped β-carotene were measured as a model study of the alkaline metal doping of polyacetylene. The correlation of these spectra together with the ab initio SCF MO calculation on model compounds show that a heavily alkaline metal doped polyacetylene chain does not have a uniform bond length structure but is composed of a charged soliton structure connected by a uniform chain. The new Raman bands were assigned based on this structure, implying that a bond alternation still exists in the metallic state of alkaline doped polyacetylene.
著者
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Tanaka Jiro
Department Of Biomaterials Okayama University Graduate School Of Medicine Dentistry And Pharmaceutic
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Tanaka Chizuko
Department Of Materials Science Faculty Of Science Kanagawa University
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Saito Yasuyoshi
Department of Chemistry, Faculty of Science, Nagoya University
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Shimizu Masaaki
Department of Chemistry, Faculty of Science, Nagoya University
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Tanaka Masashi
College of General Education, Nagoya University
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