Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine GroupsReport as inadecuate




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1

School of Industrial Technology, University Sains Malaysia, 11800 Penang, Malaysia

2

School of Chemical Sciences, University Sains Malaysia, 11800 Penang, Malaysia





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Abstract A series of new mesogenic azomethine diols were successfully synthesized by condensation reactions between various chloroalkanols and N,N-bis4-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-di4-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





Author: Issam Ahmed Mohammed 1,* , Govindarajan Sankar 1, Melati Khairuddean 2 and Abu Bakar Mohamad 2

Source: http://mdpi.com/



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