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有机化学
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有机化学 ›› 2011, Vol. 31 ›› Issue (05): 677-683. 上一篇    下一篇

研究论文

新型对称联苯双酯类液晶材料的合成和晶体结构

陈卫东1，刘勇1，张鹏云*,2，张有明1，魏太保*,1   

  1. (1西北师范大学化学化工学院 生态环境相关高分子材料教育部重点实验室 兰州 730070)
    (2甘肃省化工研究院 兰州 730020)
  • 收稿日期:2010-07-14 修回日期:2010-10-29 发布日期:2010-12-20
  • 通讯作者: 魏太保 E-mail:weitaibao@126.com

Synthesis, Crystal Structure of Novel Symmetrical Diphenylnate Liq-uid Crystal

Chen Weidong1 Liu Yong1 Zhang Pen-gyun*,2 Zhang Youming1 Wei Taibao*,1   

  1. (1 Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070)
    (2 Gansu Research Institute of Chemical Industry, Lanzhou 730020)
  • Received:2010-07-14 Revised:2010-10-29 Published:2010-12-20

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被引次数

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设计并合成了4个对称联苯双酯类液晶化合物, 化合物结构通过红外和核磁表征, 它们的介晶性通过差示扫描量热仪(DSC), X射线衍射仪(XRD)和热台偏光显微镜(POM)进行了研究. 并测定了4,4-3,3,5,5-四甲基联苯-二(4-甲基苯甲酸酯)(IIIa)的单晶结构, 结果显示: 晶体属于单斜晶系, P21/c空间群, 晶胞参数为a＝18.525(3) Å, b＝12.196(2) Å, c＝12.195(2) Å, β＝97.142(2)°, V＝2733.7(9) Å3, Z＝4, Dc＝1.163 Mg/m3, R＝0.0521, Rw＝0.1161. 化合物均为热致型互变液晶, 并讨论了氧原子、不饱和端基和端基链长对介晶性的影响.

关键词: 联苯双酯液晶, 织构, 热致型液晶, 晶体结构

Four symmetrical diphenylnate liquid crystals were prepared and their structures were confirmed by FT-IR and 1H NMR spectra. Their liquid crystal properties were tested by differential scanning calo-rimetry (DSC), X-ray diffraction (XRD) and hot stage polarizing microscop (POM). The crystal structure of IIIa was detemfined by X-ray single crystal diffraction techniques. IIIa is a monoclinic crystal system, space group P21/c with the unit cell parameters: a＝18.525(3) Å, b＝12.196(2) Å, c＝12.195(2) Å, β＝97.142(2)°, V＝2733.7(9) Å3, Z＝4, Dc＝1.163 Mg/m3, R＝0.0521, Rw＝0.1161. The results showed that molecules lead thermotropic liquid crystals properties. The relations among the mesomorphism, oxygen atoms, terminal unsaturated bond, the flexible chain length were investigated.

Key words: diphenylnate liquid crystal, texture, thermotropic liquid crystal, crystal structure