Synthesis and Mesomorphic Properties of Asymmetric Bent-Core Liquid Crystals Containing Schiff-Base Unit

ZHU Bin; HUANG Pei; HU Lan-ping; SHEN Dong

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Synthesis and Mesomorphic Properties of Asymmetric Bent-Core Liquid Crystals Containing Schiff-Base Unit

Material Physics & Chemistry | 更新时间：2020-08-12

- Synthesis and Mesomorphic Properties of Asymmetric Bent-Core Liquid Crystals Containing Schiff-Base Unit
- Chinese Journal of Liquid Crystals and Displays Vol. 25, Issue 3, Pages: 305-310(2010)
- 作者机构：
  
  华东理工大学理学院化学物理研究室上海,200237
- 作者简介：
- 基金信息：
- DOI：
  CLC： O753+.2
- Received：04 December 2009，
  
  Revised：02 January 1900，
  
  Published Online：30 June 2010，
  
  Published：30 June 2010
- 稿件说明：
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朱斌;黄佩;胡兰萍;沈冬. 含希夫碱基团的不对称弯曲型液晶分子的合成和相变研究[J]. 液晶与显示, 2010,25(3): 305-310

ZHU Bin;HUANG Pei;HU Lan-ping;SHEN Dong. Synthesis and Mesomorphic Properties of Asymmetric Bent-Core Liquid Crystals Containing Schiff-Base Unit[J]. 液晶与显示, 2010,25(3): 305-310
朱斌;黄佩;胡兰萍;沈冬. 含希夫碱基团的不对称弯曲型液晶分子的合成和相变研究[J]. 液晶与显示, 2010,25(3): 305-310 DOI：

ZHU Bin;HUANG Pei;HU Lan-ping;SHEN Dong. Synthesis and Mesomorphic Properties of Asymmetric Bent-Core Liquid Crystals Containing Schiff-Base Unit[J]. 液晶与显示, 2010,25(3): 305-310 DOI：

摘要

以3-氨基-2-甲基苯甲酸为原料

合成了含希夫碱基团的5个不对称弯曲型液晶分子

通过

H NMR、HRMS测试手段对其结构进行了表征

采用示差扫描量热法(DSC)和偏光显微镜等方法研究了它们的液晶性和相变温度

发现不仅相变温度随着分子苯环数的下降而下降

其液晶相的稳定性也随着苯环数的下降而下降

含有5个苯环的化合物呈现多个近晶相和向列相

含4个苯环的化合物则只有一个近晶相和向列相

而3个环的化合物仅在降温的过程中呈现近晶相。

Abstract

With 3-amino-2-methylbenzoic acid as starting material

five asymmetric bent-core liquid crystals containing Schiff-base unit were synthesized. Their chemical structures were confirmed by

H NMR and HRMS spectra

their liquid crystalline properties and phase transition temperatures were studied by DSC and polarizing microscopy with heating stage.It was found that the clearing points of the synthesized molecules were decreased with the decreasing of the number of benzene rings of the compounds

companying with the decreasing of the liquid crystal stability.The molecules with 5 benzene rings exhibit several semetic phases and nematic phase

whereas the molecules with 4 benzene rings exhibit one semetic phase and nematic phase

and the molecule with 3 benzene rings exhibit only monotropic semectic phase.

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Keywords

references

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. Reddy R A,Tschierske C. Bent-core liquid crystals: polar order, superstructural chirality and spontaneous desymmetrisation in soft matter systems [J]. J. Mater. Chem., 2006, 16:907-961.

. Takezoe H,Takanishi Y. Bent-core liquid crystals: their mysterious and attractive world [J]. Jpn. J. Appl. Phys., 2006, 45(2A):597-625.

. Gomola K, Guo L F, Dhara S, et al. Syntheses and characterization of novel asymmetric bent-core mesogens exhibiting polar smectic phases [J]. J. Mater. Chem., 2009, 19:4240-4247.

. 张瑞玲, 刘红.双轴向列相液晶弹性系数的理论推导[J]. 液晶与显示, 2008,24(1):1-8.

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. Prasad V, Kang S W, Suresh K A, et al. Thermotropic uniaxial and biaxial nematic and smectic phases in bent-core mesogens [J]. J. Am. Chem. Soc.,2005, 127:17224-17227.

. Madsen L A, Dingemans T J, Nakata M, et al. Thermotropic biaxial nematic liquid crystals [J]. Phys. Rev. Lett., 2004, 92(14):145505(1-4).

. Acharya B R, Primak A, Kumar S. Biaxial nematic phase in bent-core thermotropic mesogens [J]. Phys. Rev. Lett., 2004, 92(14):145506(1-4).

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