Synthesis and UV-Vis Absorption of Asymmetric Bent-Core Liquid Crystals Containing Azo Linkage

LI Zeng-Jun; SHEN Dong

doi:10.3788/YJYXS20112603.0274

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Synthesis and UV-Vis Absorption of Asymmetric Bent-Core Liquid Crystals Containing Azo Linkage

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

- Synthesis and UV-Vis Absorption of Asymmetric Bent-Core Liquid Crystals Containing Azo Linkage
- Chinese Journal of Liquid Crystals and Displays Vol. 26, Issue 3, Pages: 274-280(2011)
- 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：10.3788/YJYXS20112603.0274
  CLC： O753+.2
- Received：23 November 2010，
  
  Revised：10 January 2011，
  
  Published Online：20 June 2011，
  
  Published：20 June 2011
- 稿件说明：
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李增俊, 沈冬. 含偶氮基团的不对称弯曲型液晶分子的合成及其光谱特性[J]. 液晶与显示, 2011,26(3): 274-280

LI Zeng-Jun, SHEN Dong. Synthesis and UV-Vis Absorption of Asymmetric Bent-Core Liquid Crystals Containing Azo Linkage[J]. , 2011,26(3): 274-280
李增俊, 沈冬. 含偶氮基团的不对称弯曲型液晶分子的合成及其光谱特性[J]. 液晶与显示, 2011,26(3): 274-280 DOI： 10.3788/YJYXS20112603.0274.

LI Zeng-Jun, SHEN Dong. Synthesis and UV-Vis Absorption of Asymmetric Bent-Core Liquid Crystals Containing Azo Linkage[J]. , 2011,26(3): 274-280 DOI： 10.3788/YJYXS20112603.0274.

摘要

合成了6个含偶氮基团的具有不同苯环个数的不对称弯曲型液晶分子

用

H NMR、HRMS表征其结构

采用差示扫描量热法(DSC)和偏光显微镜(POM)研究其液晶性能。考察结果表明:所有化合物均出现了液晶相

特别是含有3个苯环的分子在较低温度下出现了向列相;偶氮基团的吸收光谱在330~360 nm出现了较强的由-

电子跃迁引起的吸收

在430~450 nm出现了较弱的由n-

电子跃迁引起的吸收

其吸收波长的变化表明分子的弯曲形状和电子分布使分子吸收波长有较大的变化。

Abstract

Six asymmetric bent-core liquid crystals with different aromatic rings containing azo linkage were synthesized. Their chemical structures were confirmed by

H NMR and HRMS spectra and the liquid crystalline property was studied with polarizing optical microscopy and differential scanning calorimeter. All of the synthesized compounds exhibit liquid crystalline phases and the compound containing three aromatic rings has nematic phase at low temperature. The absorption spectra of the azo-benzene groups display a high-intensity -

transition at about 330~360 nm and a low-intensity n-

transition at around 430~450 nm. The result that the three ring compounds have longer -

transition absorption waves than those of the four and five ring compounds may be caused by the bent shape of the molecules.

关键词

Keywords

references

Acharya B R, Primak A, Kumar S. Biaxial nematic phase in bent-core thermotropic mesogens [J]. Phys. Rev. Lett., 2004, 92(14):145506.[2] 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(49):17224-17227.[3] Jang Y, Panov V P, Kocot A, et al. Optical confirmation of biaxial nematic (Nb) phase in a bent-core mesogen [J]. Appl. Phys. Lett., 2009, 95(18):183304.[4] 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):305-310.[5] 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.[6] 马青兰,黄远明.三苯环香蕉形液晶的合成和表征 [J]. 液晶与显示, 2010,25(2):161-165.[7] Rahman M L, Asik J, Kumar S, et al. Liquid crystalline banana-shaped monomers derived from 2, 7-naphthalene: synthesis and properties [J]. Liq. Cryst., 2008, 35(11):1263-1270.[8] Lutfor M R, Hegde G, Kumar S, et al. Synthesis and characterization of bent-shaped azobenzene monomers: guest-host effects in liquid crystals with azo dyes for optical image storage devices [J]. Opt. Mater., 2009, 32(1):176-183.[9] Rahman L, Kumar S, Tschierske C, et al. Synthesis and photoswitching properties of bent-shaped liquid crystals containing azobenzene monomers [J]. Liq. Cryst., 2009, 36(4): 397-407.[10] Prasad V, Kang S W, Qi X H, et al. Photo-responsive and electrically switchable mesophases in a novel class of achiral bent-core azo compounds [J]. J. Mater. Chem., 2004, 14(9):1495-1502.

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