Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Ferroelectric Liquid Crystals from Bent-Core Molecules with Vinyl End Groups

  • Kwon, Soon-Sik (Dept. of Chemistry, Gyeongsang National University) ;
  • Kim, Tae-Sung (Dept. of Chemistry, Gyeongsang National University) ;
  • Lee, Chong-Kwang (Dept. of Chemistry, Gyeongsang National University) ;
  • Shin, Sung-Tae (Dept. of Physics, Korea University) ;
  • Oh, Lee-Tack (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) ;
  • Chien, Liang Chy (Liquid Crystal Institute, Kent State University)
  • Published : 2003.03.20
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Abstract

New banana-shaped achiral compounds, 1,3-phenylene bis [4-{4-(alkenyloxy) phenyliminomethyl}benzoate]s were synthesized by varying the length of alkenyl group; their ferroelectric properties are described. The smectic mesophases, including a switchable chiral smectic C $(Sm\;C^*)$ phase, were characterized by differential scanning calorimetry, polarizing optical microscopy and triangular wave method. The presence of vinyl groups at the terminals of linear side wings in the banana-shaped achiral molecules containing Schiff's base mesogen induced a decrease in melting temperature and formation of the switchable $(Sm\;C^*)$ phase in the melt. The smectic phases having the octenyloxy group such as $(CH_2)_6CH=CH_2$ showed ferroelctric switching, and their values of spontaneous polarization on reversal of an applied electric field were 120 nC/cm² (X=H) and 225 nC/ cm² (X=F), respectively. We could obtain ferroelectric phases by controlling the number of carbon atom in alkenyloxy chain of a bent-core molecule.

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References

  1. Vorlander, D. Ber. 1929, 63, 2831.
  2. Kondepudi, D.; Kauffmann, R. J.; Singh, N. Science 1990, 250, 975. https://doi.org/10.1126/science.250.4983.975
  3. Lennan, M.; Seul, M. Phys. Rev. Lett. 1992, 69, 2082. https://doi.org/10.1103/PhysRevLett.69.2082
  4. Pang, J.; Clark, N. A. Phys. Rev. Lett. 1994, 73, 2332. https://doi.org/10.1103/PhysRevLett.73.2332
  5. Qiu, X.; Ruiz-Gracia, J.; Stine, K. J.; Knobler, C. M.; Selinger, J. Phys. Rev. Lett. 1991, 67, 703. https://doi.org/10.1103/PhysRevLett.67.703
  6. Link, D. R.; Natale, G.; Shao, R.; Maclennan, J. E.; Clark, N. A.; Korblova, E.; Walba, D. M. Science 1997, 278, 1924. https://doi.org/10.1126/science.278.5345.1924
  7. Niori, T.; Sekine, T.; Watanabe, J.; Furukawa, T.; Takezoe, H. J. Mater. Chem. 1996, 6(7), 1231. https://doi.org/10.1039/jm9960601231
  8. Blinov, L. M. Liq. Cryst. 1998, 24, 143. https://doi.org/10.1080/026782998207677
  9. Tournihac, F.; Blinov, L. M.; Simon, J.; Yablonsky, S. V. Nature 1992, 359, 621. https://doi.org/10.1038/359621a0
  10. Sekine, T.; Takanishi, Y.; Niori, T.; Watanabe, J.; Takezoe, H. Jpn. J. Appl. Phys. 1997, 36, L1201. https://doi.org/10.1143/JJAP.36.L1201
  11. Lee, C. K.; Chien, L. C. Ferroelectrics 2000, 243, 231. https://doi.org/10.1080/00150190008008024
  12. Weissflog, W.; Lischka, Ch.; Benne, I.; Schare, T.; Pelzl, G.; Diele, S.; Kruth, H. In Proceedings of the European Conference on Liquid Crystals, Science and Technology, Zaopane: Poland, March 3-8, 1997; pp 126-132.
  13. Walba, D. M.; Dyer, D. J.; Sierra, T.; Cobben, P. L.; Shao, R.; Clark, N. A. J. Am. Chem. Soc. 1999, 118, 1211. https://doi.org/10.1021/ja952387p
  14. Walba, D. M. Science 1995, 270, 250. https://doi.org/10.1126/science.270.5234.250
  15. Hassen, A.; Alexanian, V. Tetrahedron Lett. 1978, 447.
  16. Lee, C. K.; Chien, L. C. Liq. Cryst. 1999, 26, 609. https://doi.org/10.1080/026782999205074
  17. Miyasato, K.; Abe, H.; Takezoe, A.; Kuze, E. Jpn. Phys. 1983, 22, L661. https://doi.org/10.1143/JJAP.22.L661
  18. Lee, C. K.; Kwon, S. S.; Chien, L. C.; Choi, E J. Bull. Korean Chem. Soc. 2000, 21(11), 1155.
  19. Akutagawa, T.; Matsunaga, Y.; Yasuhara, A. Liq. Cryst. 1994, 17, 659. https://doi.org/10.1080/02678299408037337
  20. Sethna, V. M.; Vries, A. D.; Spielberg, N. Mol. Cryst. Liq. Cryst. 1980, 62, 141 https://doi.org/10.1080/15421408008084016
  21. Mol. Cryst. Liq. Cryst. v.62 Sethna, V. M.;Vries, A. D.;Spielberg, N. https://doi.org/10.1080/15421408008084016

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  3. Antiferroelectric Liquid Crystal from Bent-Core Molecule with Vinyl End Group vol.25, pp.8, 2003, https://doi.org/10.5012/bkcs.2004.25.8.1171