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Dependence of Mesomorphic Behaviour of Methylene-Linked Dimers and the Stability of the NTB/NX Phase upon Choice of Mesogenic Units and Terminal Chain Length

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JournalChemistry : A European Journal
DateSubmitted - 10 Mar 2016
DateAccepted/In press - 12 Apr 2016
DateE-pub ahead of print - 31 May 2016
DatePublished (current) - 23 Jun 2016
Issue number27
Volume22
Number of pages9
Pages (from-to)9366–9374
Early online date31/05/16
Original languageEnglish

Abstract

Twelve symmetrical dimeric materials consisting of a nonamethylene (C9) spacer and either phenyl 4-(4'-alkylphenyl)benzoate, phenyl 4-(4'-alkylcyclohexyl)benzoate or phenyl 4-(4'-alkylbicyclohexyl)carboxylate mesogenic units were prepared and their mesogenic behaviour characterised by POM, DSC and XRD. All of the materials exhibited nematic phases with clearing points in excess of 200°C. Four compounds were found to exhibit the twist-bend nematic phase, with one material exhibiting a transition from the NTB phase into an anticlinic smectic 'X' phase. Across all three series of compounds the length of terminal chain is seen to dictate, to some degree, the type of mesophase formed: shorter terminal chains favour nematic and NTB mesophases, whereas longer terminal aliphatic chains were found to promote smectic phases.

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© 2016 Wiley-VCH Verlag GmbH & Co. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

    Research areas

  • Bimesogens, Liquid-crystalline dimers, Mesomorphism, Nematic phase, X-ray diffraction

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