Mesomorphic properties of achiral halogen-substituted banana-shaped compounds |
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| Authors: | Chong-Kwang Lee Soon-Sik Kwon Wang-Choel Zin Dae-Cheol Kim Sung-Tae Shin Joon-Ho Song E.-Joon Choi Liang-Chy Chien |
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| Affiliation: | a Department of Chemistry, Gyeongsang National University, Chinju 660-701, Korea.b Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.c Department of Physics, Korea University, Chungnam 339-700, Korea.d Department of Polymer Science and Engineering, Kumoh National University of Technology, Kumi 730-701, Korea.e Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA. |
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| Abstract: | Three banana-shaped achiral compounds, derivatives of 4,6-dichloro-1,3-phenylene bis-[4-(4- n -octyloxyphenyliminomethyl) benzoate], were synthesized by varying the substituent ( X =H, F and Cl). Their mesomorphic properties were investigated by differential scanning calorimetry, polarizing optical microscopy, and X-ray analysis. The compound with X = H exhibited an enantiomeric nematic phase. The compounds with X = F and Cl formed a nematic phase on heating, while on cooling they formed a nematic phase at high temperature and a smectic A phase at a lower temperature (monotropic). A schematic representation of the mesophase structures for the compound with X = F is also illustrated. |
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