Teck-Leong Lee
Universiti Tunku Abdul Rahman
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Publication
Featured researches published by Teck-Leong Lee.
International Scholarly Research Notices | 2014
Sie-Tiong Ha; Teck-Leong Lee
Two new compounds, 4-alkanoyloxybenzylidene--fluoroaniline and 4-fluorobenzylidene--n-alkanoyloxyaniline comprising a terminal fluorosubstituent were studied. The fluoro substituent contributes to the molecular polarizability, thus affecting intermolecular interactions and hence resulting in smectic mesomorphism. The mesomorphic properties were studied using differential scanning calorimetry and polarizing optical microscopy techniques. The mesomorphic properties of compounds studied are strongly dependent on the orientation of the imine (CH=N) linkage. The former Schiff base exhibited smectic A phase whereas the latter compound did not display any mesophase. Reversed imine linkage has caused depression of mesomorphic property in the compound studied (4-fluorobenzylidene--n-alkanoyloxyaniline). The mesomorphic properties of the present compounds were compared with other structurally related series to establish the chemical structure-mesomorphic property relationship.
Molbank | 2009
Sie-Tiong Ha; Teck-Ming Koh; Siew-Teng Ong; Teck-Leong Lee; Yasodha Sivasothy
A new 2-(4-propyloxyphenyl)benzothiazole was synthesized and its IR, 1H and 13C NMR and MS spectroscopic data are presented.
Molbank | 2011
Sie-Tiong Ha; Teck-Leong Lee; Yip-Foo Win; Guan-Yeow Yeap
A new Schiff base ester, 4-{[(4-iodophenyl)imino]methyl}phenyl octadecanoate was synthesized and its IR, 1H NMR, 13C NMR and EI-MS spectroscopic data are presented.
Molbank | 2011
Sie-Tiong Ha; Teck-Leong Lee; Yip-Foo Win; Guan-Yeow Yeap
A new Schiff base ester, 4-({[4-(methylthio)phenyl]methylene}amino)phenyl dodecanoate was synthesized and its IR, 1H NMR, 13C NMR and EI-MS spectroscopic data are presented.
Molbank | 2009
Sie-Tiong Ha; Teck-Ming Koh; Siew-Teng Ong; Teck-Leong Lee; Yasodha Sivasothy
2-(4-Heptyloxyphenyl)benzothiazole was synthesized and its IR, 1H NMR and MS spectroscopic data are presented.
Chinese Chemical Letters | 2011
Sie-Tiong Ha; Teck-Leong Lee; Guan-Yeow Yeap; Masato M. Ito; Ayumu Saito; Masaaki Watanabe
Asian Journal of Chemistry | 2012
Sie-Tiong Ha; Teck-Leong Lee; Hong-Cheu Lin; Masato M. Ito; Kazuma Abe; Kenji Kubo; S. Sreehari Sastry
World Academy of Science, Engineering and Technology, International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering | 2011
Sie-Tiong Ha; Teck-Leong Lee; Yip-Foo Win; Siew Ling Lee; Guan-Yeow Yeap
Asian Journal of Chemistry | 2011
Sie-Tiong Ha; Teck-Leong Lee; Guan-Yeow Yeap; Hong-Cheu Lin; Masato M. Ito; Ramesh T. Subramaniam
Archive | 2010
Guan-Yeow Yeap; Teck-Leong Lee; Teck-Ming Koh; Sie-Tiong Ha