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Guo J.,Hebei Engineering and Technology Center for Materials | Hua R.,Hebei Engineering and Technology Center for Materials | Hua R.,Tsinghua University | Sui Y.,Hebei Engineering and Technology Center for Materials | Cao J.,Hebei Engineering and Technology Center for Materials
Tetrahedron Letters | Year: 2014

The synthesis of 3,5-disubstituted 1,2,4-oxadiazoles by the cyclocondensation of amidoximes with trifluoroacetic anhydride or benzoic acid derivatives in moderate to high yields is described. The study on the phase transition behavior has disclosed that some of the synthesized oxadiazoles show smectic or nematic phases depending on their structures, which have the high potential application as liquid crystalline monomers. © 2014 Elsevier Ltd. All rights reserved.


Li N.,Shijiazhuang Chengzhi Yonghua Display Materials Co. | Li N.,Hebei Engineering and Technology Center for Materials | Li Z.,Shijiazhuang Chengzhi Yonghua Display Materials Co. | Li Z.,Hebei Engineering and Technology Center for Materials | And 5 more authors.
International Journal of Molecular Sciences | Year: 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. © 2013 by the authors; licensee MDPI, Basel, Switzerland.

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