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Vol. 33 No. 5 (2021): Vol 33 Issue 5, 2021

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Effect of Flexible Chain on Mesomorphic Properties of Alkyloxy Substituted 4-Chloroazobenzene Liquid Crystals

https://doi.org/10.14233/ajchem.2021.23138
Roushown Ali
Department of Chemistry, University of Rajshahi, Rajshahi-6205, Bangladesh
Rabiul Karim
Department of Chemistry, University of Rajshahi, Rajshahi-6205, Bangladesh
Samiul Islam Chowdhury
Department of Chemistry, Bangladesh University of Textile, Dhaka-1208, Bangladesh
Tariqul Hasan
Department of Chemistry, University of Rajshahi, Rajshahi-6205, Bangladesh

Corresponding Author(s) : Tariqul Hasan

thasan.chem@ru.ac.bd

Asian Journal of Chemistry, Vol. 33 No. 5 (2021): Vol 33 Issue 5, 2021

Abstract

Three rod-shaped alkyloxy substituted 4-chloroazobenzene liquid crystals, 1-(4-chlorophenyl)-2-[4-(alkyloxy)phenyl]diazene (hexayl, octyl and nonyl as flexible oxyalkyl chain) have been synthesized by diazotization of p-chloroaniline with phenol and subsequently performed etherification reaction with different alkyl bromides. The structures of the substituted 4-chloroazobenzene liquid crystals have been characterized by spectroscopic methods. The mesomorphic properties of the liquid crystals were examined by polarizing optical microscope (POM) and differential scanning calorimetry (DSC). All the oxyalkyl homologues of chloro substituted azobenzene showed enantiotropic smectic A (SmA) mesophase, which was understood clearly by the texture of the compounds employing polarizing optical microscope (POM) analysis. During heating scan in DSC analyses melting points, SmA-isotropic temperature and enthalphy changes associated with SmA-isotropic transition showed a remarkable impact on the spacer length of 4-chloro azobenzene derivatives.

Keywords

Liquid crystal Azobenzene Diazene Mesophase Smectic phase Isotropic temperature
Ali, R., Karim, R., Islam Chowdhury, S., & Hasan, T. (2021). Effect of Flexible Chain on Mesomorphic Properties of Alkyloxy Substituted 4-Chloroazobenzene Liquid Crystals. Asian Journal of Chemistry, 33(5), 1159–1164. https://doi.org/10.14233/ajchem.2021.23138
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