Bent Molecules with a 60° Central Core Angle that Form B7 and B2 Phases |
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| Authors: | Eun‐Woo Lee Koji Takimoto Prof?Dr Masatoshi Tokita Prof?Dr Junji Watanabe Prof?Dr Sungmin Kang |
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| Affiliation: | Organic and Polymeric Materials, Tokyo Institute of Technology, 2‐12‐1 O‐okayama, Tokyo 152‐8552 (Japan) |
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| Abstract: | Small‐angle bent‐core liquid‐crystalline (LC) molecules based on a 1,2‐bis(phenylethynyl)benzene central core have been synthesized that form banana smectic phases with a ferroelectric B7–antiferroelectric B2 phase sequence upon cooling. The formation of polar, switchable ferro‐/antiferroelectric banana phases indicates that, despite the low core bend angle of approximately 60°, banana smectic phases are still formed with the bend direction parallel to the layer. This study offers significant evidence that shows bent‐core molecules with a 60° bend angle can form the well‐known B2 and B7 banana phases. Consequently, it may lead to the preparation of a wide variety of novel bent molecules with low bend angles that spontaneously form an LC phase with both polarization and chirality. |
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| Keywords: | banana phases bent‐shaped molecules ferro/antiferro‐electricity liquid crystals X‐ray diffraction |
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