Synthesis and properties of novel fluorinated liquid crystal compounds with vinyl linking group

LI Jian; LI Juan-li; HU Ming-gang; GAN Ning; AN Zhong-wei

doi:10.3788/YJYXS20142902.0183

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Synthesis and properties of novel fluorinated liquid crystal compounds with vinyl linking group

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- Synthesis and properties of novel fluorinated liquid crystal compounds with vinyl linking group
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 2, Pages: 183-188(2014)
- 作者机构：
  
  西安近代化学研究所光电材料研究部,陕西西安,710065
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20142902.0183
  CLC： O753+.2
- Received：10 March 2013，
  
  Revised：13 October 2013，
  
  Published：05 March 2014
- 稿件说明：
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李建, 李娟利, 胡明刚, 甘宁, 安忠维. 新型乙烯桥键含氟液晶化合物的合成及性能研究[J]. 液晶与显示, 2014,29(2): 183-188

LI Jian, LI Juan-li, HU Ming-gang, GAN Ning, AN Zhong-wei. Synthesis and properties of novel fluorinated liquid crystal compounds with vinyl linking group[J]. , 2014,29(2): 183-188
李建, 李娟利, 胡明刚, 甘宁, 安忠维. 新型乙烯桥键含氟液晶化合物的合成及性能研究[J]. 液晶与显示, 2014,29(2): 183-188 DOI： 10.3788/YJYXS20142902.0183.

LI Jian, LI Juan-li, HU Ming-gang, GAN Ning, AN Zhong-wei. Synthesis and properties of novel fluorinated liquid crystal compounds with vinyl linking group[J]. , 2014,29(2): 183-188 DOI： 10.3788/YJYXS20142902.0183.

摘要

设计合成了结构新颖的乙烯桥键含氟液晶化合物。以4-溴苄溴为起始原料，经3步反应制备出目标化合物，总收率为44.1%~48.3%，目标产物色谱纯度达到99.5%以上。产物结构经IR、

HNMR、MS确认。用DSC和POM对化合物的相变温度进行了测试，发现该类化合物均呈现向列相。乙烯桥键引入后分子长径比增大，导致熔点、清亮点上升，液晶相区增加。物理测试表明，目标化合物具有清亮点高、介电各向异性大、折光率高的特点，能够缩短液晶响应时间，在液晶显示中具有较好的应用前景。

Abstract

A new series of fluorinated liquid crystal compounds with vinyl linking group was designed and synthesized via 3 steps reaction with a purity higher than 99.5% and overall yield of 44.1%~48.3% by using 4-bromobenzyl bromide as starting materials. Their structures were identified by IR

HNMR and MS and their phase transition temperatures were tested by DSC and polarized optical microscope. It is found that all of the new compounds show only nematic phase

and both the melting points and clearing points increased compared with that of similar compounds without vinyl linking group due to an elongated molecular conjugation. The measurement of physical properties indicate that the compounds have higher clearing point

lager

and

and fast response time which is suitable for liquid crystal display.

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Keywords

references

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