噻二唑类弯曲型液晶分子的合成和性能研究

李双全; 沈冬

doi:10.3788/YJYXS20112604.0421

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噻二唑类弯曲型液晶分子的合成和性能研究

材料物理和化学 | 更新时间：2020-08-12

- 噻二唑类弯曲型液晶分子的合成和性能研究
- Synthesis and Property of Bent-Core Liquid Crystals with Thiadiazole
- 液晶与显示 2011年26卷第4期页码：421-426
- 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：
  
  国家自然科学基金(No.60878047)()
- DOI：10.3788/YJYXS20112604.0421
  中图分类号： O753+.2
- 收稿日期：2011-12-20，
  
  修回日期：2011-02-15，
  
  网络出版日期：2011-08-20，
  
  纸质出版日期：2011-08-20
- 稿件说明：
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李双全, 沈冬. 噻二唑类弯曲型液晶分子的合成和性能研究[J]. 液晶与显示, 2011,26(4): 421-426

LI Shuang-quan, SHEN Dong. Synthesis and Property of Bent-Core Liquid Crystals with Thiadiazole[J]. , 2011,26(4): 421-426
李双全, 沈冬. 噻二唑类弯曲型液晶分子的合成和性能研究[J]. 液晶与显示, 2011,26(4): 421-426 DOI： 10.3788/YJYXS20112604.0421.

LI Shuang-quan, SHEN Dong. Synthesis and Property of Bent-Core Liquid Crystals with Thiadiazole[J]. , 2011,26(4): 421-426 DOI： 10.3788/YJYXS20112604.0421.

摘要

合成了两个系列以1

4-噻二唑为中心基团的弯曲型分子

结合偏光显微熔点仪(POM)观察和差示量热扫描法(DSC)研究了它们的液晶性能。研究发现

这两类弯曲型分子都会出现N相。其中

对称型五环酯类噻二唑弯曲型分子的熔点都较高

清亮点均超过360 ℃;含烯丙基非对称噻二唑类弯曲型分子熔点和清亮点温度大幅度降低

N相的温区较宽

以庚基为端基链的弯曲型分子出现N相的温度区间超过120 ℃。

Abstract

Two series of bent-core liquid crystals with 1

4- thiadiazole as the center unit were synthesized

their liquid crystalline properties were studied by POM and DSC. It is found that both of these two serie thiadiazole compounds exhibite N phase. Among them

the symmetric five benzene ring thiadiazole ester compounds have rather high melting points

the clearing temperatures are more than 360 ℃. The melting points and clearing temperatures of the asymmetric thiadiazole molecules with allyl terminal chains are significantly reduced

and the bent-core molecule with heptyl as terminal groups shows N phase at a very wide temperature range (>120 ℃).

关键词

Keywords

references

Freiser M J. Ordered states of a nematic liquid [J]. Phys. Rev. Lett., 1970, 24(19): 1041-1043.[2] Mathete J, Nguyen H, Tinhlevelut A M. New mesogens with six, four, or three paraffinic chains [J]. Chem. Commun., 1986, (20): 1548-1549.[3] Niori T, Sekine T, Watanabe J, et al. Distinct ferroelectric smectic liquid crystals consisting of banana shaped achiral molecules [J]. J. Mater. Chem., 1996, (6): 1231-1233.[4] 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).[5] 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).[6] Grtz V, Goodby J W. Enantioselective segregation in achiral nematic liquid crystals [J]. Chem. Commun., 2005, 26:3262-3264.[7] Zafiropoulos N A, Lina W, Picken S J, et al. Asymmetric oxadiazole mesogens as candidates for low-temperature biaxial nematics [J]. Liq. Cryst., 2009, 36(6&7):649-656.[8] Dingemans T J, Samulski E T. Nonlinear Boomerang-shaped liquid crystals derived from 2, 5-l)-1,3,4-oxadiazole [J]. Liq. Cryst., 2000, 27(1): 131-136.[9] Lehmann M, Khn C, Kresse H, et al. Synthesis and properties of oxadiazole based V-shaped, shape persistent nematogens [J]. Chem. Commun., 2008, (15): 1768-1770.[10] 黄佩, 胡兰萍, 沈冬.噁二唑类弯曲形液晶分子的合成[J]. 液晶与显示 ,2010,25(5):626-634.[11] 朱斌,黄佩,胡兰萍,等.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):305-311.

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