Browse > Article
http://dx.doi.org/10.5012/bkcs.2003.24.3.274

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)
Publication Information
Bulletin of the Korean Chemical Society / v.24, no.3, 2003 , pp. 274-278 More about this Journal
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.
Keywords
Banana-shaped liquid crystal; Switchable smectic C; Spontaneous polarization; Ferroelectric properties; Bent-core molecule;
Citations & Related Records

Times Cited By Web Of Science : 8  (Related Records In Web of Science)
Times Cited By SCOPUS : 8
연도 인용수 순위
1 /
[ Sethna, V. M.;Vries, A. D.;Spielberg, N. ] / Mol. Cryst. Liq. Cryst.   DOI   ScienceOn
2 Pang, J.; Clark, N. A. Phys. Rev. Lett. 1994, 73, 2332.   DOI   ScienceOn
3 Lee, C. K.; Kwon, S. S.; Chien, L. C.; Choi, E J. Bull. Korean Chem. Soc. 2000, 21(11), 1155.
4 Tournihac, F.; Blinov, L. M.; Simon, J.; Yablonsky, S. V. Nature 1992, 359, 621.   DOI
5 Hassen, A.; Alexanian, V. Tetrahedron Lett. 1978, 447.
6 Sethna, V. M.; Vries, A. D.; Spielberg, N. Mol. Cryst. Liq. Cryst. 1980, 62, 141   DOI   ScienceOn
7 Niori, T.; Sekine, T.; Watanabe, J.; Furukawa, T.; Takezoe, H. J. Mater. Chem. 1996, 6(7), 1231.   DOI   ScienceOn
8 Lee, C. K.; Chien, L. C. Liq. Cryst. 1999, 26, 609.   DOI   ScienceOn
9 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.
10 Walba, D. M.; Dyer, D. J.; Sierra, T.; Cobben, P. L.; Shao, R.; Clark, N. A. J. Am. Chem. Soc. 1999, 118, 1211.   DOI   ScienceOn
11 Walba, D. M. Science 1995, 270, 250.   DOI   ScienceOn
12 Vorlander, D. Ber. 1929, 63, 2831.
13 Blinov, L. M. Liq. Cryst. 1998, 24, 143.   DOI   ScienceOn
14 Lennan, M.; Seul, M. Phys. Rev. Lett. 1992, 69, 2082.   DOI   ScienceOn
15 Miyasato, K.; Abe, H.; Takezoe, A.; Kuze, E. Jpn. Phys. 1983, 22, L661.   DOI   ScienceOn
16 Akutagawa, T.; Matsunaga, Y.; Yasuhara, A. Liq. Cryst. 1994, 17, 659.   DOI   ScienceOn
17 Kondepudi, D.; Kauffmann, R. J.; Singh, N. Science 1990, 250, 975.   DOI   ScienceOn
18 Qiu, X.; Ruiz-Gracia, J.; Stine, K. J.; Knobler, C. M.; Selinger, J. Phys. Rev. Lett. 1991, 67, 703.   DOI   ScienceOn
19 Link, D. R.; Natale, G.; Shao, R.; Maclennan, J. E.; Clark, N. A.; Korblova, E.; Walba, D. M. Science 1997, 278, 1924.   DOI   ScienceOn
20 Sekine, T.; Takanishi, Y.; Niori, T.; Watanabe, J.; Takezoe, H. Jpn. J. Appl. Phys. 1997, 36, L1201.   DOI   ScienceOn
21 Lee, C. K.; Chien, L. C. Ferroelectrics 2000, 243, 231.   DOI   ScienceOn