Symmetrical trimeric star-shaped mesogens based on 1,3,5-trisubstituted benzene incorporating Schiff base and azobenzene fragments as the peripheral units: Synthesis and mesomorphic properties

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• 作者：GUAN-YEOW YEAP (1)
  YEW-HONG OOI (1)
  NOZOMI UCHIDA (2)
  MASATO M ITO (2)
  
• 关键词：Star ; shaped liquid crystals ; symmetrical ; terminal substituent ; Schiff base and azobenzene moieties ; comparative study
• 刊名：Journal of Chemical Sciences
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：126
• 期：3
• 页码：847-859
• 全文大小：
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• 作者单位：GUAN-YEOW YEAP (1)
  YEW-HONG OOI (1)
  NOZOMI UCHIDA (2)
  MASATO M ITO (2)
  
  1. Liquid Crystal Research Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia
  2. Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, Hachioji, Tokyo, 192-8577, Japan
  
• ISSN：0973-7103

文摘

Two series of symmetrical three-armed star-shaped mesogens based on 1,3,5-trihydroxybenzene as a core unit, interconnecting three Schiff base or azobenzene moieties via oxymethylene spacers have been synthesized and characterized by spectroscopic techniques. Every member in these series possesses either chlorine (Cl) or bromine (Br) terminal atom, with different alkyl spacer length (C n H 2n whereby n ranging from 3 to 6). Their thermal stability and mesomorphic properties are investigated by employing DSC and POM. The dependence of phase transition in relation to the alkyl spacer length is shown by both series. These star-shaped mesogens exhibit only nematic and smectic phases. The difference between the two series lies on the structure of linking group in the peripheral units (-CH=N- for series PSB-X-n and -N=N- for series PAZ-X- n). Therefore, a comparison study of the mesomorphic properties between these two series of star-shaped mesogens is discussed whereby the azobenzene-based mesogens are thermally more stable than the Schiff base counterpart. In addition, soft crystalline phase is observed for the azobenzene-based star-shaped mesogens possessing hexyl alkyl spacer. Graphical Abstract Synthesis and evaluation of liquid crystalline behaviour of two series of non-conventional star-shaped liquid crystals consisting of a benzene core group bearing three identical Schiff base or azobenzene moieties as peripheral units are reported. The structure-mesomorphic property relationship of the present star-shaped mesogens are also described.