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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 8
BKCSDE 25(8)
August 20, 2004 

Antiferroelectric Liquid Crystal from Bent-Core Molecule with Vinyl End Group
Chong-Kwang Lee*, Soon-Sik Kwon, Tae-Sung Kim, Sung-Tae Shin, Hong Choi, E-Joon Choi, Sea-Yun Kim, Wang-Choel Zin, Dae-Choel Kim, Liang-Chy Chien
Banana-shaped liquid crystal, Switchable smectic C, Spontaneous polarization, Antiferroelectric properties, Bent-core molecule
Three banana-shaped achiral compounds, 4-chloro-1,3-phenylene bis [4-{4-(undecenyloxy)phenyl iminomethyl} benzoate] derivatives, were synthesized with variation of a substituent (x=H, F, Cl); their antiferroelectric properties are described. The smectic mesophases, including a switchable chiral smectic C(Sm C*) 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* 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/cm2.
1171 - 1176
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