標題: | Synthesis and Mesomorphic Properties of 4-(Methylthio)benzylidene-4 '-n-alkanoyloxyanilines |
作者: | Ha, Sie-Tiong Lee, Teck-Leong Yeap, Guan-Yeow Lin, Hong-Cheu Ito, Masato M. Subramaniam, Ramesh T. 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | Thermotropic liquid crystal;Schiff base;Nematic;4-(Methylthio)benzylidene-4 '-n-alkanoyloxyanilines |
公開日期: | 1-Oct-2011 |
摘要: | A homologous series of Schiff base esters, 4-(methylthio)benzylidene-4'-n-alkanoyloxyanilines possessing even number of carbon atoms at the alkanoyloxy chain (C(n-1)H(2n-1)COO, n = 2 to 18) was synthesized. The structure of the 4-(methylthio)benzylidene-4'-n-alkanoyloxyanilines was confirmed by elemental analysis and spectroscopic techniques including FT-IR, (1)H and (13)C NMR and EI-MS. Mesomorphic properties were evaluated by differential scanning calorimetry and polarizing optical microscopy techniques. Whilst n-butanoyloxy to n-octanoyloxy derivatives exhibited monotropic nematic phase, n-ethanoyloxy and n-decanoyloxy to n-octadecanoyloxy derivatives were non-mesogenic compounds. The mesomorphic properties of the present series were compared with other structurally related series to establish the chemical structure-mesomorphic property relationship. |
URI: | http://hdl.handle.net/11536/14767 |
ISSN: | 0970-7077 |
期刊: | ASIAN JOURNAL OF CHEMISTRY |
Volume: | 23 |
Issue: | 10 |
起始頁: | 4609 |
結束頁: | 4612 |
Appears in Collections: | Articles |