Temperature Dependence of the Absorption Spectra of Bithiophene and Terthiophene Isolated Molecules in Cyclodextrin(Condensed matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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The temperature dependence of the absorption spectra of 2,2'-bithiophene and 2,2' : 5',2"-terthiophene isolated molecules in cyclodextrin (CyD) were investigated between 15 K to room temperature (RT). The optical absorption spectra of BT molecules in β- and γ-CyD, (BT)_<β-CyD> and (BT)_<γ-CyD> are nearly the same between 15 K and RT. Those of TT are almost the same for (TT)_<β-CyD> and (TT)_<γ-CyD>. Anomalous temperature dependence of the absorption intensities was observed. The absorption intensities of the isolated molecules of BT and TT in CyD, (BT)_<CyD> and (TT)_<CyD> increase with increasing temperatures. The s-trans states of (BT)_<CyD> and (TT)_<CyD> convert to the s-cis states at high temperatures through the rotational vibration around the single bond between thiophene rings. The allowed transition of the s-cis conformation would mix to the forbidden transition of s-trans conformation, thus the absorption intensity increases at high temperatures.
- 2004-11-15
著者
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Gombojav Bold
Department Of Physics Faculty Of Science Yamagata University
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Itoh Hiroki
Department Of Cardiology Tokyo Women's Medical University
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Yoshinari Takehisa
Department Of Physics Faculty Of Science Tohoku University
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Kuriyama Yasunao
Department Of Chemistry School Of Science Kitasato University
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Nagasaka Shin-ichiro
Department Of Physics Faculty Of Science Yamagata University
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Koyama Kiyohito
Department Of Material Science And Engineering Faculty Of Engineering Yamagata University
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Koyama Kiyohito
Department of Chemical Engineering, Yamagata Unirersity
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