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The Effect of Substituents on LC Behavior of Bis(p-substituted phenyl) 2-Decyloxyterephthalate
The Effect of Substituents on LC Behavior of Bis(p-substituted phenyl) 2-Decyloxyterephthalate
Journal of the Korean Chemical Society. 2000. Apr, 44(2): 127-137
  • Published : April 20, 2000
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Park, Joo-Hoon
Lee, Jong-Kyu
Choi, Ok-Byung
So, Bong-Keun
Lee, Soo-Min
Lee, Jun-Woo
Jin, Jung-Il

Abstract
Eleven new compounds that are composed of bis(p-substituted phenyl) terephthalate unitand the decyloxy pendant as lateral were synthesized and their thermal and liquid crystalline properties were studied by the differential scanning calorimetry (DSC) and on a hot-stage of a polarizing microscope. The ter-minal substituent groups of the compound were varied; X= -H(II-H), -F(lI-F), -CII(II-CI), -Br(ll-Br), -I(II-I), -$NO_2(lI-NO_2$), $-CF_3(II-CF_3$), -$OC_2H_5(II-OC_2H_5$), -$OC_4H_9(II-OC_4H_9$), -$C_6H_5(Il-C_6H_5$). The compounds of $II-OC_2H_5,\;II-OC_4H_9$ and $II-C_6H_5$ were monotropically nematic. In contrast, the compounds of Il-H, II-F, II-Cl, II-Br, II-I, $lI-NO_2$, $II-CF_3$, and II-CN did not show liquid crystalline properties.