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Molecules 2010, 15(5), 3260-3269; doi:10.3390/molecules15053260
Article

Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups

1,* , 1, 2 and 2
1 School of Industrial Technology, University Sains Malaysia, 11800 Penang, Malaysia 2 School of Chemical Sciences, University Sains Malaysia, 11800 Penang, Malaysia
* Author to whom correspondence should be addressed.
Received: 10 March 2010 / Revised: 30 March 2010 / Accepted: 6 April 2010 / Published: 30 April 2010
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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 thermotropic liquid crystal; nematic phase; diols; azomethine
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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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.

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