Tuning mesomorphic properties and handedness of chiral calamitic liquid crystals by minimal modification of the effective core

Authors

  • Anhua Liu,

    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, People's Republic of China Contribution to the Proceedings of the 22nd International Symposium on Chirality [ISCD 22].
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  • Qiming Sun,

    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, People's Republic of China Contribution to the Proceedings of the 22nd International Symposium on Chirality [ISCD 22].
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  • Jiaxi Cui,

    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, People's Republic of China Contribution to the Proceedings of the 22nd International Symposium on Chirality [ISCD 22].
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  • Jia Zheng,

    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, People's Republic of China Contribution to the Proceedings of the 22nd International Symposium on Chirality [ISCD 22].
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  • Wenjian Liu,

    Corresponding author
    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, People's Republic of China Contribution to the Proceedings of the 22nd International Symposium on Chirality [ISCD 22].
    • Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of MOE, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China. E-mail: xhwan@pku.edu.cn or liuwj@pku.edu.cn

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  • Xinhua Wan

    Corresponding author
    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, People's Republic of China Contribution to the Proceedings of the 22nd International Symposium on Chirality [ISCD 22].
    • Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of MOE, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China. E-mail: xhwan@pku.edu.cn or liuwj@pku.edu.cn

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Abstract

Two pairs of calamitic liquid crystalline molecules, (+)-2-[4′-(S)-sec-butoxyphenyl]-5-(4′-hexoxyphenyl)toluene () and (+)-2-(4′-hexoxyphenyl)-5-[4′-(S)-sec-butoxyphenyl]toluene (), (−)-2-[4′-(R)-sec-butoxyphenyl]-5-(4′-hexoxyphenyl)toluene () and (−)-2-(4′-hexoxyphenyl)-5-[4′-(R)-sec-butoxyphenyl]toluene (), have been designed and synthesized. Each of the molecules consists of a p-terphenyl core substituted with a methyl group on the middle ring, a chiral sec-butoxy tail, and an achiral n-hexoxy tail. The geometrical difference between () and () lies only in the location of the methyl group on the effective mesogenic core. Yet, such a small change in the structure gives rise to remarkable differences in mesogenic properties and handedness. Both and have an enantiotropic cholesteric phase (N*) and a monotropic twist grain boundary C* phase (TGBC*), whereas and exhibit only a monotropic N* phase. Moreover, () and () have opposite handedness in the N* phase, and and even have a helical inversion from N* to TGBC* phase through a non-helical chiral mesophase. Chirality, 2011. © 2011 Wiley Periodicals, Inc.

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