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

Mahabaleshwara Subrao, Poornima Bhagavath, Sangeetha G. Bhat, Girish Sharada Ramachandra, D. M. Potukuchi, Srinivasulu Maddasani

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)400-410
Number of pages11
JournalLiquid Crystals
Volume43
Issue number3
DOIs
Publication statusPublished - 19-02-2016

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Oxadiazoles
Liquid Crystals
Liquid crystals
Ferroelectric materials
liquid crystals
rings
synthesis
Fluorine
Benzoates
Substitution reactions
ambient temperature
fluorine
Electrons
substitutes
Temperature
electrons
diphenyl

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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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.",
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Four ring achiral ferroelectric liquid crystals of 1,2,4-oxadiazoles : synthesis and characterisation. / Subrao, Mahabaleshwara; Bhagavath, Poornima; Bhat, Sangeetha G.; Sharada Ramachandra, Girish; Potukuchi, D. M.; Maddasani, Srinivasulu.

In: Liquid Crystals, Vol. 43, No. 3, 19.02.2016, p. 400-410.

Research output: Contribution to journalArticle

TY - JOUR

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T2 - synthesis and characterisation

AU - Subrao, Mahabaleshwara

AU - Bhagavath, Poornima

AU - Bhat, Sangeetha G.

AU - Sharada Ramachandra, Girish

AU - Potukuchi, D. M.

AU - Maddasani, Srinivasulu

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AB - 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.

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