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Int. J. Mol. Sci. 2013, 14(12), 23257-23273; doi:10.3390/ijms141223257

Synthesis of 1,4-Bis(phenylethynyl)benzenes and Their Application as Blue Phase Liquid Crystal Composition

1 Department of Chemistry, Tsinghua University, Beijing 100084, China 2 Beijing R&D Center, Shijiazhuang Chengzhi Yonghua Display Materials Co. Ltd., Beijing 100083, China 3 Hebei Engineering & Technology Center for FPD Materials, Shijiazhuang 050091, China
* Author to whom correspondence should be addressed.
Received: 14 September 2013 / Revised: 16 October 2013 / Accepted: 11 November 2013 / Published: 25 November 2013


A number of 1,4-bis(phenylethynyl)benzene derivatives (BPEBs) and their analogues with different numbers of side-substitute fluorine atoms on benzene rings, and alkyl chains, ethoxyl groups, fluorine atoms and trifluoromethyl groups as the end groups have been synthesized. The effects of the different substituents on their properties such as thermal behavior of melting point and clearing point, the temperature of nematic phase, optical anisotropy and dielectric anisotropy have been well investigated, and it has been found that some BPEBs have a wide range of the nematic phase temperature with high optical anisotropy (Δn) and acceptable dielectric anisotropy (Δε), which have been applied as the crucial compositions to constitute a liquid crystal mixture having the properties of Δε = 29.0 and Δn = 0.283 at 25 °C. With the addition of the chiral dopant to the obtained liquid crystal mixture, blue phase liquid crystal with a blue phase temperature range of 8 °C has been achieved.
Keywords: 1,4-bis(phenylethynyl)benzene derivatives; blue phase; liquid crystal 1,4-bis(phenylethynyl)benzene derivatives; blue phase; liquid crystal
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Li, N.; Li, Z.; Zhang, X.; Hua, R. Synthesis of 1,4-Bis(phenylethynyl)benzenes and Their Application as Blue Phase Liquid Crystal Composition. Int. J. Mol. Sci. 2013, 14, 23257-23273.

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