Four ring achiral ferroelectric liquid crystals of 1,2,4-oxadiazoles: synthesis and characterisation

Subrao, Mahabaleshwara and Bhagavath, Poornima and Bhat, Sangeetha G and Girish, S R and Potukuchi, D M and Srinivasulu, M (2016) Four ring achiral ferroelectric liquid crystals of 1,2,4-oxadiazoles: synthesis and characterisation. Liquid Crystals, 43 (3). pp. 400-410. ISSN 1366-5855

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Abstract

A novel series of four-ring achiral ferroelectric liquid crystals containing 1,2,4-oxadiazole cores with unsymmetrical substitutions at C-3 and C-5 positions are synthesised and characterised. A fluoro substituted biphenyl moiety is prepared by Suzuki coupling reaction and is directly attached to the oxadiazole core at the C-5 position for the first time in the literature. An octyl benzoate is attached to the oxadiazole core at the C-3 position of it. All the compounds exhibit polar smectic (B2) mesophases with ferroelectric switching along with the orthogonal smectic-A mesophases. These compounds possess high mesomorphic thermal ranges of polar smectic phases and are towards the ambient temperatures. The influence of a more electronegative fluorine substituent on the electron rich biphenyl moiety (at the C-5 position) of the oxadiazole core is analysed for the prevalence and abundance of polar smectic (ferroelectric) mesophases

Item Type: Article
Uncontrolled Keywords: Achiral liquid crystals; Suzuki coupling; smectic-A phase; B2 phase; ferroelectric nature; spontaneous polarisation; mesomorphic thermal ranges
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 21 Mar 2016 16:29
Last Modified: 21 Mar 2016 16:29
URI: http://eprints.manipal.edu/id/eprint/145603

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