Synthesis and Properties of Novel Isothiocyanatotolane Liquid Crystals with Terminal Difluorovinyl Substitute

	Synthesis and Properties of Novel Isothiocyanatotolane Liquid Crystals with Terminal Difluorovinyl Substitute
	Li, J. L.; Z. H. Peng; J. Li; M. G. Hu; Z. W. An and L. Zhang
	2017
发表期刊	Chemical Journal of Chinese Universities-Chinese
卷号	38 期号:10
摘要	Four kinds of new isothiocyanate liquid crystals composed of tolane core and difluorovinyl terminal group (A1-A4) were synthesized via five step reactions based on 4-iodobenzaldehyde, and four ethyl analogues B1-B4 as comparison structures were also prepared. The structure characterizations of all related pro. ducts were performed using infrared spectrometer (IR), H-1-nuclear magnetic resonance (H-1 NMR) and mass spectrometer (MS). The mesomorphic properties were investigated by differential scanning calorimeter (DSC) and hot stage polarizing optical microscope (HS-POM). The birefringence values and rotational viscosity were extrapolated. The results showed that the target compounds A1, A2 and A3 exhibit wider nematic phase range (31-62 degrees C). Replacement of ethyl chain by difluorovinyl as terminal group is enabled to not only enlarge the nematic phase temperature range but also increase birefringence (Delta n = 0. 038-0.052) and reduce rotational viscosity. The high birefringence mixtures based new liquid crystals with terminal difluorovinyl sub. stitute have wider nematic phase range, higher birefringence, lower rotational viscosity and larger figure-of-merit (FoM).
收录类别	sci ; ei
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/59004
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Li, J. L.,Z. H. Peng,J. Li,et al. Synthesis and Properties of Novel Isothiocyanatotolane Liquid Crystals with Terminal Difluorovinyl Substitute[J]. Chemical Journal of Chinese Universities-Chinese,2017,38(10).
APA	Li, J. L.,Z. H. Peng,J. Li,M. G. Hu,&Z. W. An and L. Zhang.(2017).Synthesis and Properties of Novel Isothiocyanatotolane Liquid Crystals with Terminal Difluorovinyl Substitute.Chemical Journal of Chinese Universities-Chinese,38(10).
MLA	Li, J. L.,et al."Synthesis and Properties of Novel Isothiocyanatotolane Liquid Crystals with Terminal Difluorovinyl Substitute".Chemical Journal of Chinese Universities-Chinese 38.10(2017).

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