無鏈彎曲形分子之構形對液晶性質之影響及引入具立體障礙氟原子對形成扇葉構形對筒型液晶排列螺旋性之影響

郭芷綺

doi:10.6846/TKU.2011.00808

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無鏈彎曲形分子之構形對液晶性質之影響及引入具立體障礙氟原子對形成扇葉構形對筒型液晶排列螺旋性之影響

Influences of Sterically Congested Fluoro Substituents in Hexakis(pheneylethynyl)benzenes on the Helical Columnar Packing

郭芷綺 , Masters　　Advisor：徐秀福　　

英文 DOI： 10.6846/TKU.2011.00808

液晶；彎曲型；無鏈；盤形；掌性；掌性放大；螺旋； liquid crystal ； bent-rod ； chainfree ； discotic ； chiral induction ； chiral amplification ； helical swirl

Abstract │ Reference (91) │ Altmetrics

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The structure-property relationships of liquid crystalline behaviors have been well discussed in the past few decades. In general, the resulting intermolecular cohesion determines the fusion temperature of crystal and flexible chains lower the transition temperatures, thereby stabilizing the mesophases. Nevertheless, there are only a few example on the formation of liquid crystalline phases from mesogens without flexible chains.
Herein, we investigated the effect of the molecular geometry, especially the dihedral angle and the dipole moment on liquid crystal formation of mesogenic compounds without flexible chains. A series of new bent-rod LCs without flexible chains were studied.
Induced supramolecular chirality has been observed and reported in columnar LCs when the columns are twisted along the column axis to give helical structures. Hexaynylphenylbenzenes are prochiral due to the possible propeller-like geometry by rotation of sidearms. In this content, one or two lateral fluoro groups were incorporated ortho to ethynyl group onto on peripheral phenyl of hexaynylphenylbenzene. With unique combination of small size and high polarity, fluoro substituent can efficiently modify the mesogenic properties without significantly affecting the molecular geometry. In here, the sterics by the fluoro group(s) is to increase the dihedral angle of the F-attached phenyl and central phenyl to result in a more pronounced propeller geometry. The synthesized fluoro-containing compounds are expected to show higher ordering levels associated to helical disposition along the columns and more efficient chiral amplification is anticipated when these compounds are doped into non-chiral analogs.

Reference ( 91 ) 〈TOP〉

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8. Chandrasekhar, S., Liquid Crystals. 2nd ed.; Cambridge University Press: Cambridge, 1992.
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