Intrinsic chiral domains enantioselectively segregated from twisted nematic cells of bent-core mesogens |
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Authors: | Choi Suk-Won Kang Sungmin Takanishi Yoichi Ishikawa Ken Watanabe Junji Takezoe Hideo |
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Institution: | Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Tokyo, Japan. |
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Abstract: | Enantioselective segregation has been attained in the Bx phase of a novel substituted oxadiazole achiral banana-shaped liquid crystal (LC) without introducing any chiral species. This bent-core molecule exhibits LC polymorphism; the higher temperature nematic (N) phase and the lower temperature banana smectic phase (Bx phase), in which spontaneous chiral segregation with (+) and (-) chiral domains occurs with equal probabilities. In twisted cell geometries, extrinsically induced twisted N structures are formed and result in intrinsically chiral conglomerate when the temperature is decreased from N to Bx. The observed optical activity in homochiral Bx phase is comparable to those theoretically predicted and is proportional to the cell thickness. |
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Keywords: | chiral symmetry breaking optical activity circular dichroism bent‐core molecule twisted cell geometry |
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