Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Antiferroelectric Liquid Crystal from Bent-Core Molecule with Vinyl End Group

  • Lee, Chong-Kwang (Dept. of Chemistry, Gyeongsang National University) ;
  • Kwon, Soon-Sik (Dept. of Chemistry, Gyeongsang National University) ;
  • Kim, Tae-Sung (Dept. of Chemistry, Gyeongsang National University) ;
  • Shin, Sung-Tae (Dept. of Physics, Korea University) ;
  • Choi, Hong (Dept. of Physics, Korea University) ;
  • Choi, E. Joon (Dept. of Polymer Science and Engineering, Kumoh National University of Technology) ;
  • Kim, Sea-Yun (Dept. of Polymer Science and Engineering, Kumoh National University of Technology) ;
  • Zin, Wang-Choel (Dept. of Material Science and Engineering, Pohang University of Science and Technology) ;
  • Kim, Dae-Choel (Dept. of Material Science and Engineering, Pohang University of Science and Technology) ;
  • Chien, Liang-Chy (Liquid Crystal Institute, Kent State University)
  • Published : 2004.08.20
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Abstract

Three banana-shaped achiral compounds, 4-chloro-1,3-phenylene bis [4-{4-(undecenyloxy)phenyl imino-methyl} benzoate] derivatives, were synthesized with variation of a substituent (x=H, F, Cl); their antiferro-electric properties are described. The smectic mesophases, including a switchable chiral smectic C(Sm $C^{\ast}$) phase, were characterized by differential scanning calorimetry, polarizing optical microscopy, triangular wave method, and X-ray diffractometry. The presence of vinyl groups at the terminals of linear side wings in the banana-shaped achiral molecules induced a decrease in melting temperature and formation of the switchable Sm $C^{\ast}$ phase in the melt. The smectic phase having a lateral fluorine-substituent at 3-position of the Schiff's base moiety showed antiferroelctric switching, and the value of spontaneous polarization on reversal of an applied electric field was 250 nC/$cm^2$ .

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References

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Cited by

  1. Synthesis and Mesomorphic Properties of Some Chiral Fluorinated Benzoates vol.493, pp.1, 2008, https://doi.org/10.1080/15421400802406455
  2. Antiferroelectric Liquid Crystal from Bent-Core Molecule with Vinyl End Group. vol.36, pp.1, 2005, https://doi.org/10.1002/chin.200501203