Abstract
A synthesis of a new type of chalcone analogue banana-shaped liquid crystals compounds is described. The approach involved the reaction of hydroxyl chalcones with isophthaloyl dichloride to form benzene-1,3-dicarbonyl-bis-1-(4-alkoxyphenyl)-3-(4-hydroxylphenyl)prop-2-en-1-one (7a-c and 8a-c) having two chalcone units via esterification reaction. The hydroxyl chalcones, which differ in the length of alkyl group, CnH2n+1, where n= 10, 12 and 14 were synthesised via Claisen Schmidt condensation prior to the reaction with isophthaloyl dichloride. The reaction was a catalyst dependence. No sign of product was formed by employing NaH (60%). It was only occurred in the presence of NaH (95%) to afford banana shape bi-functional monomer of ester chalcone 7a-c and 8a-c. The synthesized compound was characterized by 1H and 13C Nuclear Magnetic Resonance (NMR), and Fourier Transform Infrared (FTIR).________________________________________GRAPHICAL ABSTRACT
Highlights
Liquid crystal technology has been widely applied in device technology
Series of linear shape of mesogens based on chalcone has been studied for their liquid crystal behavior [2,3]
Chalcone derivatives were reported for excellent nonlinear optic property [4] and liquid crystal displays [5,6]
Summary
Liquid crystal technology has been widely applied in device technology. Chalcone derivatives were reported for excellent nonlinear optic property [4] and liquid crystal displays [5,6]. Banana-shaped liquid crystals have been given much attention in various aspects such as fast polarization reorientation, ferroelectricity and antiferroelectricity, and small threshold voltage when applied to liquid crystal display mode [9]. Banana-shaped liquid crystals have been identified as interesting compounds due to their unexpected electro-optical properties, polarity and chirality [10]. We describe the preparation of a new type banana shape compound of benzene-1,3-dicarbonylbis-1-(4-alkoxyphenyl)-3-(4-hydroxylphenyl)prop-2-en-1one 5a-c possessing alkyl chains of varying length from C10 to C14 which potentially used for liquid crystal studies
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