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Department of Chemical Science, Faculty of Science Universiti Tunku Abdul Rahman, Jln Universiti, Bandar Barat 31900 Kampar, Perak Tel: +605-4688888; Fax: +605-4661676 Email address: hast@utar.edu.my |
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Dr Ha Sie Tiong, Assistant Professor |
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Selected Publications- Refereed International Journals 1. Ha, S.T.*, Lee, T.L., Lee, S.L., S.S. Sastry & Win, Y.F., Schiff Base Liquid Crystals with Terminal Iodo Group: Synthesis and thermotropic properties, Sci. Res. Essays., 2011, in press. 2. Ha, S.T.*; Foo, K.L.; Subramaniam, R.T.; Ito, M.M.; Sastry, S.S. & Ong, S.T., Heterocyclic benzoxazole-based liquid crystals: Synthesis and mesomorphic properties, Chin. Chem. Lett., 2011, 22, 1191-1194. 3. Ha, S.T.*; Lee, T.L.; Yeap, G.Y.; Lin, H.C.; Ito, M.M. & Subramaniam, R.T., Synthesis and mesomorphic properties of 4-(methylthio)benzylidene-4’-n-alkanoyloxyanilines, Asian J. Chem., 2011, 23(10), 4609-4612. 4. Ha, S.T., Yeap, G.Y., Boey, P.L., Synthesis and Mesomorphic Properties of new Schiff Base Liquid Crystals, N-[4-(4-n-Alkanoyloxybenzoyloxy)-2-Hydroxybenzylidene]-4-Substituted-Anilines, Res. J. Chem. Environ., 2011, 15(2), 677-682. 5. Ha, S.T.*; Win, Y.F.; Lee, S.L.; Ito, M.M.; Abe, K.; Oonishi, H. & Yeap, G.Y., Synthesis, spectral studies of 4-{[(3-substitutedphenyl)imino]methyl}-3-hydroxyphenyl octadecanoate and effect of meta substituents on mesomorphic properties, Int. J. Phys. Sci., 2011, 6(10), 2507-5217. 6. Koh, T.M.; Ha, S.T.*; Lee, T.L.; Lee, S.L.; Yeap, G.Y.; Lin, H.C. & Subramaniam, R.T., Synthesis and mesomorphic evaluation of new calamitic liquid crystals containing benzothiazole core, Chin. Chem. Lett., 2011, 22, 619-622. 7. Ha, S.T.*; Lee, T.L.; Yeap, G.Y., Ito, M.M., Saito, A. & Watanabe, M., Mesomorphic behavior of new azomethine liquid crystals having terminal iodo group, Chin. Chem. Lett., 2011, 22, 260-263. 8. Ha, S.T.*; Yip, F.W., Koh, T.M. & Chong, Y.T., Synthesis and characterization of 4-{[(3-cyanophenyl)imino]methyl}-3-hydroxyphenyl octadecanoate, Aust. J. Basic Appl. Sci., 2011, 5(1), 15-19. 9. Ha, S.T.*; Yeap, G.Y. & Boey, P.L., Mesomorphic Properties of Biphenyl Derivatives with Cholesteryl Moiety, Int. J. Phys. Sci., 2010, 5(14), 2185-2192. 10. Ha, S.T.*; Ong, L.K.; Yeap, G.Y.; Ito, M.M.; Saito, A., Watanabe, M. & Lee, S.L., Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers, Sci. Res. Essays, 2010, 5(19), 3018-3026. 11. Ha, S.T.*; Koh, T.M.; Yeap, G.Y.; Lin, H.C.; Lee, S.L; Win, Y.F. & Ong, S.T., Synthesis and Mesomorphic Properties of 6-Methoxy and 6-Ethoxy-2-(2-hydroxy-4-alkanoyloxybenzylideneamino)benzothiazoles, Mol. Cryst. Liq. Cryst., 2010, 528, 10-22. 12. Ha, S.T.; Ng, M.Y., Subramaniam, R.T.; Ito, M.M.; Saito, A.; Watanabe, M.; Lee, S.L. & Bonde, N.L., Mesogenic Azomethine Esters with Different End Groups: Synthesis and Thermotropic Properties, Int. J. Phys. Sci., 2010, 5(8), 1256-1262. 13. Ha, S.T.*; Yip, F.W. & Thea, K.Y., Synthesis and Characterization of a New Homologous Series of Benzothiazole Ether with Lateral Methoxy Group, World Appl. Sci. J., 2010, 9(4): 380-384. 14. Ha, S.T.*; Koh, T.M.; Lee, S.L.; Yeap, G.Y.; Lin, H.C. & Ong, S.T., Synthesis of New Schiff Base Ester Liquid Crystals Comprising Benzothiazole Core, Liq. Cryst., 2010, 37(5): 547-554. 15. Ha, S.T.*; Ong, L.K.; Lee, S.L.; Lin, H.C.; Win, Y.F. & Ong, S.T., Synthesis and mesomorphic properties of Schiff base esters possessing terminal chloro substituent, Chin. Chem. Lett., 2010, 21: 637-640. 16. Ha, S.T.*, Koh, T.M.; Yeap, G.Y.; Lin, H.C.; Lee, S.L.; Win, Y.F. & Ong, S.T., Mesogenic Schiff base esters with benzothiazole core: synthesis and phase transition studies, Phase Transitions, 2010, 83(3), 195-204. 17. Ha, S.T.*; Ong, L.K.; Win, Y.F.; Sivasothy, Y.; Yeap, G.Y. and Boey, P.L., The synthesis and characterization of new Schiff bases: 4[(pyridine-4-yl-methylene)amino]phenylalkanoates, Aust. J. Basic Appl. Sci., 2010, 4(6): 1146-1151. 18. Ha, S.T.*; Ong, L.K.; Yasodha, S.; Yeap, G.Y.; Lin, H.C.; Lee, S.L.; Boey, P.L. & Bonde, N.L., Mesogenic Schiff base esters with terminal chloro group: Synthesis, thermotropic properties and X-ray diffraction studies, Int. J. Phys. Sci., 2010, 5(5): 564-575. 19. Ha, S.T.*; Yeap, G.Y. & Boey, P.L., Synthesis and smectogenic A and C* Properties of (S)-(-)-2-Methylbutyl 4’-(4”-n-alkanoyloxybenzoyloxy)biphenyl-4-carboxylates, Int. J. Phys. Sci., 2010, 5(3), 182-191. 20. Ha, S.T.* & Ong, L.K., New mesogenic Schiff base esters containing chloro end group: synthesis and thermotropic properties, World Appl. Sci. J., 2010, 9(1): 45-48. 21. Ha, S.T.* and Win, Y.F., Total Assignment of NMR Spectral Lines of Schiff Base Derivatives with Pyridine Core, World Appl. Sci. J., 2010, 8(8): 1007-1012. 22. Ha, S.T.*, Ong, L.K.; Sivasothy, Y. & Win, Y.F., Synthesis of new Schiff bases with Dialkylamino end groups and effect of terminal branching on mesomorphic properties, World Appl. Sci. J., 2010, 8(5), 641-646. 23. Ha, S.T.*, Ong, L.K., Win, Y.F., Yeap, G.Y., Bonde, N.L. & Boey, P.L., New Schiff bases with pyridine core: spectral, thermal and optical characterizations, Am. J. Applied Sci., 2010, 7(5), 656-660. 24. Ha, S.T.*; Ong, L.K.; Sivasothy, Y.; Yeap, G.Y.; Boey, P.L.; Lin, H.C., New mesogenic Schiff base esters with polar chloro substitutent: synthesis, thermotropic properties and X-ray diffraction studies, Am. J. Applied Sci., 2010, 7(2), 214-220. 25. Ha, S.T.*, Yeap, G.Y. & Boey, P.L., Synthesis and Liquid Crystalline Properties of New Schiff Bases N-[4-(4-n-Alkanoyloxybenzoyloxy)benzylidene]-4-Cyano-, 4-Hydroxy-, 4-Thio-and 4-Nitroanilines, Aust. J. Basic Appl. Sci., 2009, 3(4), 3417. 26. Ha, S.T.*; Koh, T.M.; Ong, S.T. & Sivasothy, Y., Synthesis and mesomorphic behavior of benzothiazole-based liquid crystals having terminal methoxyl group, Chin. Chem. Lett., 2009, 20, 1449. 27. Ha, S.T.*; Koh, T.M.; Yeap, G.Y.; Lin, H.C.; Beh, J.K.; Win, Y.F. & Boey, P.L., New Mesogenic Schiff base esters comprising benzothiazole moiety: Synthesis and mesomorphic properties, Chin. Chem. Lett., 2009, 20, 1081. 28. Ha, S.T.*; Ong L.K.; Ong, S.T.; Yeap, G.Y.; Wong, J.P.W.; Koh, T.M. & Lin, H.C., Synthesis and mesomorphic properties of new Schiff base esters with different alkyl chains, Chin. Chem. Lett., 2009, 20, 767. 29. Ha, S.T.*, Koh, T.M.; Lin, H.C.; Yeap, G.Y.; Win, Y.F.; Ong, S.T.; Sivasothy, Y.; Ong, L.K., Heterocyclic benzothiazole-based liquid crystals: synthesis and mesomorphic, Liq. Cryst., 2009, 36(9), 917-925. 30. Ha, S.T.*; Koh, T.M.; Yeap, G.Y.; Lin, H.C., Boey, P.L.; Win, Y.F.; Ong, S.T. & Ong, L.K., Synthesis and mesomorphic properties of 2-(4-alkyloxyphenyl)benzothiazoles, Mol. Cryst. Liq. Cryst., 2009, 506, 56. 31. Ha, S.T.*; Ong, L.K.; Wong, J.P.W., Yeap, G.Y., Lin, H.C.; Ong, S.T. & Koh, T.M., Mesogenic Schiff’s base ether with dimethylamino end group, Phase Transitions, 2009, 82, 387. 32. Yeap, G.Y.*; Ha, S.T.; Boey, P.L.; Mahmood, W.A.K.; Ito, M.M. & Youhei, Y., Synthesis and characterization of some new mesogenic Schiff base esters N-[4-(4-n-hexadecanoyloxybenzoyloxy)benzylidene]-4-substituted-anilines, Mol. Cryst. Liq. Cryst., 2006, 452, 73-90. 33. Yeap, G.Y.*; Ha, S.T.; Lim, P.L.; Boey, P.L.; Ito, M.M.; Sanehisa, S. & Vill, V., Nematic and smectic A phases in ortho-hydroxy-para-hexadecanoyloxybenzylidene-para-substituted anilines, Mol. Cryst. Liq. Cryst., 2006, 452, 63-72. 34. Yeap. G.Y.*; Ha, S.T.; Lim, P.L.; Boey, P.L.; Ito, M.M.; Sanehisa, S. & Youhei, Y., Synthesis, physical and mesomorphic properties of Schiff base esters containing ortho-, meta- and para-substituents in benzylidene-4’-alkanoyloxyanilines, Liq. Cryst., 2006, 33(2): 205-211. 35. Yeap, G.Y.*; Ha, S.T.; Lim, P.L.; Boey, P.L. & Mahmood, W.A.K., Synthesis and mesomorphic properties of Schiff base esters ortho-hydroxy-para-alkyloxybenzylidene-para-substituted anilines, Mol. Cryst. Liq. Cryst., 2004, 423: 73-84. 36. Yeap, G.Y.*; Ha, S.T.; Ito, M.M.; Boey, P.L. & Mahmood, W.A.K., Synthesis, Fourier transform infrared, 1D and 2D NMR spectral studies on the conformation of two new cholesteryl 4-alkoxyphenyl-4’-benzoates, J. Mol. Struct.,, 2004, 687: 57-64. 37. Yeap, G.Y.*; Ha, S.T.; Nakamura, Y.; Boey, P.L.; Mahmood, W.A.K.; Ito, M.M.; Nakai, H. & Yamaki, M., Fourier transform infrared and conformational analysis of cholesteryl 4-n-alkoxybenzoates in solution, Spectrosc. Lett., 2004, 37(4), 319-336. 38. Yeap, G.Y.*; Ha, S.T.; Ishizawa, N.; Suda, K.; Boey, P.L. & Mahmood, W.A.K., Synthesis, crystal structure and spectroscopic study of para substituted 2-hydroxy-3-methoxybenzalideneanilines, J. Mol. Struct., 2003, 658, 87-99. |
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Academic & Professional Qualifications PhD (Organic Synthetic Chemistry) (Universiti Sains Malaysia) 2006 B.Sc (Hons.) Chemistry (Universiti Sains Malaysia) 2002 Associate, Malaysian Institute of Chemistry, AMIC |
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Research Field Liquid Crystals Researcher ID: F-4994-2010 (http://www.researcherid.com/rid/F-4994-2010) Scopus ID: 36951416200, 7202501121 |
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Awards Pacifichem Young Scholar Award (2010)- American Chemical Society Tan Sri Datuk Ong Kee Hui Postgraduate Chemistry Medal (2006)- Institut Kimia Malaysia Best Postgraduate Research Award (Bronze Prize) (2004)- Universiti Sains Malaysia National Science Fellowship (2003–2005)- Ministry of Science, Technology and Innovation of Malaysia |
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Research Grants A Study of Polarisability Effect on Mesomorphism of New Nematic and Smectic Compounds Possessing Phenyl Benzoate and Benzylideneaniline Cores UTAR Research Fund, 2011-2012 Synthesis and Physical Properties of Symmetrical and Non-Symmetrical Dimer Liquid Crystals UTAR Research Fund, 2010-2011 Synthesis, molecular structure and mesomorphic properties of new heterocyclic benzoxazole-, benzothiazole- and pyridine-based liquid crystals UTAR Research Fund, 2009-2010 Synthesis and Liquid Crystal Properties of Some Benzothiazole Derivatives Malaysian Toray Science Foundation, 2008-2010 |