Journal: Drug Invention Today

Article Id: JPRS-CPS-00004713
Title: Synthesis and characterization new liquid crystals of Schiff base using microwave radiation
Category: Chemistry and Parallel Synthesis
Section: Research Article
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    Background: Schiff base compounds have been almost important in many applications, for example, in the industry of paper, coloring agents for foods, and in liquid crystalline displays. Some azomethine compounds are very interesting material because of rich liquid crystalline polymorphism. Liquid crystals were discovered in 1888 by Australian Botanist Friedrich Reinitzer. The liquid crystal state was between the traditional solid and liquid phases and this is the origin of the term “mesogenic state.” The aim of the present work is to synthesize three series of Schiff bases S1 , S2 , and S3 using the microwave; the synthesized Schiff base has a number of carbon atoms at the terminal alkoxy chain with liquid crystal properties. Methodology: The prepared compounds were characterized qualitatively by Fourier transform infrared, 1 H-NMR, 13 C-NMR, and CHN analysis. The liquid crystalline properties of L1 -L11 were verified using differential scanning calorimetry and hot-stage polarizing microscope (polarizing optical microscope). Results: A series of Schiff base (S1-S3) have been synthesized from the reaction of different amines (o-phenyldiamine,3,3’-dimethylbiphenyl-4,4’-diamine, pyridine-2,6-diamine) with some substituted aldehydes. The 1 H-NMR spectra of the synthesized compounds (S1-S3) in the DMSO-d6 as a solvent exhibited a singlet peak at 8.75, 8.56, and 8.67 ppm, respectively. Conclusion: Three series of Schiff bases S1, S2, and S3 were prepared using the microwave; the synthesized Schiff base has a number of carbon atoms at the terminal alkaoxyl chain with liquid crystal properties.

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    Author(s) Name:

    Athra G. Sager1 *, Athra H. Mekky2

    Affiliation(s) Name:

    1 Department of Chemistry, College of Science, University of Wasit, Wasit, Kut, Iraq,

    2 Department of Chemistry, College of Science, University of Thi-Qar, Iraq

    *Corresponding author: Athra G. Sager, Department of Chemistry, College of Science, University of Wasit, Kut, Iraq.

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    Author:

    Athra G. Sager1 *, Athra H. Mekky2

    Title:Synthesis and characterization new liquid crystals of Schiff base using microwave radiation
    Journal:Drug Invention Today
    Vol(issue):14 (January)
    Year:2020
    Page No: (70-78)
  • Experimental Methods Keywords

    Methodology:Mesomorphic, Nematic, Synthesis and characterization
    Research Materials:Schiff base, Liquid crystal

Keywords

Schiff base Mesomorphic Nematic Liquid crystal

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