Influence of polar substituents on the mesomorphism of non-symmetrical achiral four-ring bent-core compounds: synthesis and characterisation

Influence of polar substituents on the mesomorphism of non-symmetrical achiral four-ring bent-core compounds: synthesis and characterisation

The synthesis and characterisation of stable achiral asymmetrical four-ring banana-shaped molecules are presented. These consist of a laterally fluoro-substituted 3,4'-disubstituted biphenyl unit with an ester linkage between the phenyl rings as the central unit in 4-(N-4'-n-alkyloxysalicy...

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Bibliographic Details
Published in:Liquid crystals Vol. 39; no. 7; p. 889
Main Authors: Nath, Rahul Kanti, Sarkar, Dipika Debnath, Shankar Rao, Doddamane S, Nandiraju, V S Rao
Format: Journal Article
Language:English
Published: Abingdon Taylor & Francis Ltd 01-07-2011
Subjects:
Asymmetry
Chemical compounds
Chemical synthesis
Hydrogen bonds
Molecular chemistry
Phase transitions
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Summary:The synthesis and characterisation of stable achiral asymmetrical four-ring banana-shaped molecules are presented. These consist of a laterally fluoro-substituted 3,4'-disubstituted biphenyl unit with an ester linkage between the phenyl rings as the central unit in 4-(N-4'-n-alkyloxysalicylidene)aminophenyl [2-fluoro-5-(N-4'-n-alkyloxy-salicylidene) amino-benzoate]. These compounds are thermally and hydrolytically stable due to inter- or intramolecular hydrogen bonding and exhibit columnar (B1) phases. The phases have been characterised by thermal microscopy and differential scanning calorimetry. A representative example has also been characterised by X-ray diffraction. [PUBLICATION ABSTRACT]
ISSN:0267-8292
1366-5855