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Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups
School of Industrial Technology, University Sains Malaysia, 11800 Penang, Malaysia
School of Chemical Sciences, University Sains Malaysia, 11800 Penang, Malaysia
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Received: 10 March 2010; in revised form: 30 March 2010 / Accepted: 6 April 2010 / Published: 30 April 2010
Abstract: A series of new mesogenic azomethine diols were successfully synthesized by condensation reactions between various chloroalkanols and N,N'-bis(4-hydroxy)-benzylidene-o-toluidine (1). The structures of these compounds were confirmed by CHN, FT-IR, 1H-NMR, and 13C-NMR spectrophotometer. Their thermotropic liquid crystalline behavior was studied using differential scanning calorimetry (DSC) and polarizing optical microscope (POM). 4,4'-di(4-Hydroxybutoxy)-N-benzylidine-o-tolidine (2a) does not exhibit liquid crystalline properties. A nematic texture was observed for mesogenic diols 2b, and 2d, whereas the diol 2c exhibits a smectic mesophase. The increase of terminal alkyl chain in these mesogenic diols leads to a decrease in the transition temperature.
Keywords: thermotropic liquid crystal; nematic phase; diols; azomethine
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Mohammed, I.A.; Sankar, G.; Khairuddean, M.; Mohamad, A.B. Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups. Molecules 2010, 15, 3260-3269.
Mohammed IA, Sankar G, Khairuddean M, Mohamad AB. Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups. Molecules. 2010; 15(5):3260-3269.
Mohammed, Issam Ahmed; Sankar, Govindarajan; Khairuddean, Melati; Mohamad, Abu Bakar. 2010. "Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups." Molecules 15, no. 5: 3260-3269.