引用本文:
Sie Tiong Ha, Teck Leong Lee, Siew Ling Lee, Guan Yeow Yeap, Yip Foo Win, Siew Teng Ong. Mesomorphic behaviour of new azomethine liquid crystals having terminal bromo substituent[J]. Chinese Chemical Letters,
2012, 23(2): 177-180.
doi:
10.1016/j.cclet.2011.10.022
Citation: Sie Tiong Ha, Teck Leong Lee, Siew Ling Lee, Guan Yeow Yeap, Yip Foo Win, Siew Teng Ong. Mesomorphic behaviour of new azomethine liquid crystals having terminal bromo substituent[J]. Chinese Chemical Letters, 2012, 23(2): 177-180. doi: 10.1016/j.cclet.2011.10.022
Citation: Sie Tiong Ha, Teck Leong Lee, Siew Ling Lee, Guan Yeow Yeap, Yip Foo Win, Siew Teng Ong. Mesomorphic behaviour of new azomethine liquid crystals having terminal bromo substituent[J]. Chinese Chemical Letters, 2012, 23(2): 177-180. doi: 10.1016/j.cclet.2011.10.022
Mesomorphic behaviour of new azomethine liquid crystals having terminal bromo substituent
摘要:
A homologous series of azomethine esters, 4-n-alkanoyloxybenzylidene-4'-bromoanilines possessing even number of carbon atoms at the terminal alkanoyloxy chain (Cn-1H2n-1COO-, n=8, 10, 12, 14, 16, 18) was synthesized and characterized. Whilst n-octanoyloxy to n-dodecanoyloxy derivatives exhibited enantiotropic smectic A and smectic B phases, n-tetradecanoyloxy to n-octadecanoyloxy derivatives possessed enantiotropic smectic A and monotropic smectic B properties. n-Decanoyloxy derivatives demonstrated the optimum exhibition for both smectic A and smectic B phases. It was found that the length of terminal alkanoyloxy chain has an influence on mesomorphic properties.
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关键词:
- Liquid crystals
- / Schiff base ester
- / Enantiotropic
- / Smectic A
- / Smectic B
English
Mesomorphic behaviour of new azomethine liquid crystals having terminal bromo substituent
Abstract:
A homologous series of azomethine esters, 4-n-alkanoyloxybenzylidene-4'-bromoanilines possessing even number of carbon atoms at the terminal alkanoyloxy chain (Cn-1H2n-1COO-, n=8, 10, 12, 14, 16, 18) was synthesized and characterized. Whilst n-octanoyloxy to n-dodecanoyloxy derivatives exhibited enantiotropic smectic A and smectic B phases, n-tetradecanoyloxy to n-octadecanoyloxy derivatives possessed enantiotropic smectic A and monotropic smectic B properties. n-Decanoyloxy derivatives demonstrated the optimum exhibition for both smectic A and smectic B phases. It was found that the length of terminal alkanoyloxy chain has an influence on mesomorphic properties.
-
Key words:
- Liquid crystals
- / Schiff base ester
- / Enantiotropic
- / Smectic A
- / Smectic B
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