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Liquid Crystals Volume 41, 2014 - Issue 12
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Original Articles

Tolane liquid crystals bearing fluorinated terminal group and their mid-wave infrared properties

Minggang HuXi’an Modern Chemistry Research Institute, Xi’an, P.R. China
,
Zhongwei AnXi’an Modern Chemistry Research Institute, Xi’an, P.R. China;School of Materials Science and Engineering, Shaanxi Normal University, Xi’an, P.R. ChinaCorrespondence[email protected]
,
Jian LiXi’an Modern Chemistry Research Institute, Xi’an, P.R. China
,
Lingchao MoXi’an Modern Chemistry Research Institute, Xi’an, P.R. China
,
Zhi YangXi’an Modern Chemistry Research Institute, Xi’an, P.R. China
,
Juanli LiXi’an Modern Chemistry Research Institute, Xi’an, P.R. China
,
Zhaoyi CheXi’an Modern Chemistry Research Institute, Xi’an, P.R. China
&
Xiaozhe YangXi’an Modern Chemistry Research Institute, Xi’an, P.R. China
 show all
Pages 1696-1702 | Received 30 Jun 2014, Accepted 24 Jul 2014, Published online: 22 Aug 2014
 
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Abstract

This paper describes the synthesis and characterisation of several liquid crystal (LC) compounds having a tolane core structure and a trifluoromethoxy terminal group. The mesomorphic properties, mid-wave infrared (IR) absorption and birefringence were investigated. These materials exhibit low absorption in mid-wave IR regions (MWIR) and high birefringence (Δn ~ 0.26–0.29). The impact of fluorine substitution was investigated. Compounds with monofluorine exhibit wide mesophase temperature (88.5°C), and the mesomorphic behaviour weakened with increasing fluorine atom. The results show that they are promising LC materials for applications in the MWIR.

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