Heterocyclic compounds-based liquid crystals: Synthesis and mesomorphic properties

Nadia Baqir Hussain; Nisreen Hussein Karam

doi:10.53730/ijhs.v6nS10.13557

Authors

Nadia Baqir Hussain
Nadia.hussain@qu.edu.iq
Department of Medical Biotechnology, College of Biotechnology, University of Al-Qadisiyah, Diwaniya/Iraq
Nisreen Hussein Karam Department of Chemistry, College of Education for Pure Science (Ibn-Al-Haitham), University of Baghdad, Baghdad/Iraq

Keywords:

liquid crystal, mesomorphic, heterocyclics, pyrrole

Abstract

A series of liquid crystals comprising a heterocyclics dihydro pyrrole and 1,2,3-triazole rings [VII]-[X] were synthesized by many steps starting from a reaction of 3,3'-dimethyl-[1,1'-biphenyl]-4,4'-diamine with chloroacetyl chloride in a mixture of solutions DMF and TEA to synthesise the compounds [I], then the compounds [I] reacted with malononitrile in 1,4-dioxane and TEA solutions to produce compounds [II], then the first step is repeated with compound [II] where it reacted with chloroacetyl chloride in mixture of DMF and TEA to give compound [III], this compound reacted with sodium azide in the presence of sodium chloride and DMF as solvent to produce the compound [IV], which reacted with acrylic acid by a 1.3 dipolar reaction in solvent THF to give compound [V], this compound which reacted with thionyl chloride to gave carbonyl chlorides compound [VI], finally the last compound reacted with a variety of amines to product compounds [VII]a-d. The structures of the synthesized compounds were actually determined by Fourier-transform infrared spectroscopy FT-IR and Proton nuclear magnetic resonance 1H-NMR, The properties of liquid crystalline were characterized by hot stage Polarising Optical Microscope POM. The synthesized molecules exhibited enantiotropic liquid crystal phases, and the compounds [VII]a-d exhibited an enantiotropic nematic phase only.liquid crystal

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