Synthesis and Mesophase Behaviour of Azo Ester With Terminal Ketone Group: Comparison of Mesomorphic Properties With Related Structure.

ABSTRACT

            The novel LC’s frame work has been synthesised and mesomorphic properties impact by terminal group and additional methylene group. The present series have total 12 compound C-1 to C-16, which differentiated by methylene group. Among 12 compound four compound is smectic and eleven compound nematic in nature.  The mesophase behaviour was carried out by polarized optical microscope (POM).  The structure of LC compound was confirm by ¹H-NMR, IR and Mass spectroscopy. The smectic thermal stability is 168.05 ⁰C and nematic thermal stability is 203.07 ⁰C. The mesophase length is 12.3 ⁰C to 83.3⁰C.

Reference:

• [1] Priestly, E. Introduction to liquid crystals. Springer Science & Business Media, 2012.

• [2] Andrienko, Denis. “Introduction to Liquid Crystals.” Journal of Molecular Liquids 267 (2018): 520-541.
• [3] Collings, Peter J., and John W. Goodby. Introduction to Liquid Crystals: Chemistry and physics. Crc Press, 2019.
• [4] Wojtowicz, Peter J., Ping Sheng, and E. B. Priestley, eds. Introduction to liquid crystals. New York: Plenum Press, 1975.

• [5] Lebwohl, Paul A., and Gordon Lasher. “Nematic-liquid-crystal order—a Monte Carlo calculation.” Physical Review A 6.1 (1972): 426.

• [6] Bisoyi, Hari Krishna, and Sandeep Kumar. “Discotic nematic liquid crystals: science and technology.” Chemical Society Reviews 39.1 (2010): 264-285.

• [7] Lubensky, T. C. “Molecular description of nematic liquid crystals.” Physical Review A 2.6 (1970): 2497.

• [8] Dozov, I., and C. Meyer. “Analogy between the twist-bend nematic and the smectic A phases and coarse-grained description of the macroscopic NTB properties.” Liquid Crystals 44.1 (2017): 4-23.

• [9] Fuhrmann, Edgar, and Jörg Talbiersky. “Synthesis of alkyl aryl ethers by catalytic Williamson ether synthesis with weak alkylation agents.” Organic process research & development 9.2 (2005): 206-211.

• Hendrickson, James B., and Walter A. Wolf. “Direct introduction of the diazo function in organic synthesis.” The Journal of Organic Chemistry 33.9 (1968): 3610-3618.

• Jordan, Andrew, et al. “A solvent-reagent selection guide for Steglich-type esterification of carboxylic acids.” Green Chemistry 23.17 (2021): 6405-6413.

• Roviello, Antonio, and Augusto Sirigu. “Odd‐even effects in polymeric liquid crystals.” Die Makromolekulare Chemie 183.4 (1982): 895-904.

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WSN 204 (2025) 328-341

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