Dynamics of exciplex formation in cholesteric liquid crystals containing carbazolyl and terephthaloyl group.

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概要

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• Dynamics of exciplex formation was studied on cholesteric liquid crystals consisting of cholesteryl 3-(9-ethyl-3-carbazolyl)propanoate (3Cz-2), cholesteryl 5-phenylpentanoate (Ph-4), and cholesteryl methyl terephthalate (CMT) with different amounts of CMT. Transient fluorescence spectrum and the analysis of fluorescence rise and decay curves of the exciplex emission indicated that two types of exciplex are present at low temperatures. Rate constants of exciplex formation were obtained at different temperatures in the cholesteric and isotropic phases. The activation energy for the rate constant was nearly zero in the cholesteric phase, but it was positive (3–6 kcal mol<SUP>−1</SUP>) in the isotropic phase. The difference was interpreted in terms of different mechanisms of exciplex formation in the two phases.

• 公益社団法人 日本化学会の論文

著者

• TANIGUCHI Yoshio

  Advanced Research Laboratory, Hitachi Ltd.

• Taniguchi Yoshio

  Advanced Research Laboratory Hitachi Ltd.

• Sisido Masahiko

  Research Laboratory Of Resources Utilization Tokyo Institute Of Technology

• Kawaguchi Koji

  Department Of Gastroenterological Surgery Oita University Faculty Of Medicine

• Imanishi Yukio

  Department Of Material Chemistry Graduate School Of Engineering Kyoto Univeresity

• Kiguchi Masashi

  Advanced Research Laboratory Hitachi Ltd.

• IMANISHI Yukio

  Department of Polymer Chemistry, Kyoto University

• Kawaguchi Koji

  Department of Polymer Chemistry, Kyoto University

• Sisido Masahiko

  Research Center for Medical Polymers and Biomaterials, Kyoto University

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