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

Richard J. Mandle*, John W. Goodby

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)9366–9374
Number of pages9
JournalChemistry : A European Journal
Issue number27
Early online date31 May 2016
Publication statusPublished - 23 Jun 2016

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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


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

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