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

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

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

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