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Synthesis of Liquid Crystal Mesogenes Derived From Isophthalic Acid and Terephthalic Acid
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| Author:
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FATIMAH A. ABED, JUMBAD H. TOMMA , NISREEN H. KARAM
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| Abstract:
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Two series of bent and liner core mesogen containing 1,2,4-traizole ring [VI]a,g and series were synthesized by many steps starting from esterification of isophthalic acid and terephathalic acid with methanol to yield diester compound [I]a,b which was converted to their acid hydrazide [II]a,b and the acid hydrazide reacted with ammonium thiocyanate or diester reacted with thiosemicarbazide to yield compounds [III]a,b. Then cyclization by 4% NaOH to yielded 1,2,4 traizole-3- thiol compounds [IV]a,b , afterword adding hydrazine hydrate to yield compounds [V]a,b. These compounds condensated with different substituted aldehyde to give new Schiff bases[VI]a,b ,[VII]a,b . Also , reaction acid hydrazide [II]a,b with aldehyde [VII] to yielded Schiff bases [IX]a,b and then reaction with thioglycolic acid to yielded thiazolidinone [X]a,b in addition to synthesized Schiff bases [XI]a,b from reaction compounds [V]a,b with aldehyde [VIII].
The synthesized compounds were characterized by melting points , FT-IR ,1H-NMR and Mass spectroscopy (some of them).The liquid crystalline properties were studied by hot stage polarizing optical microscopy(POM) and differential scanning calorimetry DSC .
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| Keyword:
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isophthalic acid, liquid crystal , Schiff base, terephthalic acid , thiazolidin-4-one 1,2,4-Triazole,
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| EOI:
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-
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| DOI:
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https://doi.org/10.31838/ijpr/2020.SP1.123
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| Download:
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