1. Preparation and properties of laterally multifluorinated benzoxazole-based nematic mesogens.
- Author
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Duan, Longyan, Shi, Dingqian, Chen, Pei, Hu, Kun, Ren, Liyuan, Chen, Xinbing, and An, Zhongwei
- Subjects
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MESOGENS , *FLUORINATION , *HETEROCYCLIC compounds , *MESOPHASES , *POLARITY (Chemistry) - Abstract
Series of laterally multifluorinated heterocyclic compounds, 2-(2ʹ,3-difluoro-4ʹ-alkoxy-1,1ʹ-biphenyl-4-yl)-benzoxazole derivatives (nPF(2)PF(3)Bx), are prepared and characterised. They mainly display enantiotropic nematic mesophases with wider mesophase ranges of 12–107°C (heating process) and 22–134°C (cooling process) than the corresponding analogues. The enhanced nematic mesophase stability is achieved via slightly increasing inter-ring twist angle with inter-ring lateral fluorine substitute in biphenyl unit, as well as through improving the molecular polarity with multifluorine substitutes. Meanwhile, two inter-ring lateral fluorine atoms lead to a decrease in melting/clearing points and a wide nematic mesophase range, which makes it possible for heterocyclic mesogens nPF(2)PF(3)Bx to use in nematic liquid crystal display mixtures. [ABSTRACT FROM PUBLISHER]
- Published
- 2017
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