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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
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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