Synthesis and Mesomorphic Characterisation of Chiral Homologues

• Published in: Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Vol. 364; no. 1; pp. 575 - 587
• Main Authors: Dave, Jayrang S., Menon, Meera R., Patel, Pratik R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.08.2001; Gordon and Breach
• Subjects: average thermal stabilities; Chiral homologues; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Liquid crystals; Liquids and liquid crystals; Liquids, emulsions, and suspensions; liquid crystals; mesogens; mesomorphism; Physics; smectic C; Structure of solids and liquids; crystallography; Transition temperature; Smectic crystals; Mesomorphism; Chain length; Esters; Chiral compound; Ferroelectric properties; Experimental study; Liquid crystals; Texture; Aldimine; Mesogenic compound; Thermal properties; Imines; Homologous series; Benzenic compound; Property structure relationship; Ethers; Chemical synthesis; Spontaneous polarization; Organic compounds
• ISSN: 1058-725X
• DOI: 10.1080/10587250108025027

Chiral liquid crystals have attracted considerable interest as they exhibit a good variety of modulated phases. We have synthesised a homologous series viz., 4-(4 ! -n-alkoxy benzoyloxy) benzylidene-4 !! −1-(s)-methyl propoxy anilines, incorporating a terminal chiral centre, inorder to obtain better understanding of the relationship between molecular structure and appearance of SmC* phase in the molecules. It is observed that, in the present series the lower members upto butyl are pure nematogens, while pentyl to hexadecyl derivatives exhibit classical smectic as well as nematic mesophases. An additional smectic C* phase is observed in the middle octyl to dodecyl homologues. The homologues have been characterised by IR, NMR and DSC. Their mesomorphic properties have been compared with structurally related homologous series.