Twist-Bend Nematogenic Supramolecular Dimers and Trimers Formed by Hydrogen Bonding

Rebecca Walker* (Corresponding Author), Damian Pociecha, Alfonso Martinez-Felipe, John MD Storey, Ewa Gorecka, Corrie T Imrie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)
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A selection of novel non-symmetric supramolecular liquid crystal dimers and trimers formed by hydrogen-bonding have been prepared and their phase behaviour characterised by polarised optical microscopy, X-ray diffraction and temperature-dependent Fourier-transform infrared spectroscopy. We mix the bent twist-bend nematogen 4-[6-(4’-cyanobiphenyl-4-yl) hexyloxy]-benzoic acid (CB6OBA) with a series of small stilbazole-based compounds 4-[(E)-2-(n-alkoxyphenyl)ethenyl]pyridines (nOS) of varying terminal chain length (n) to obtain the CB6OBA:nOS complexes. Complexes with n ≤ 7 exhibit nematic and twist-bend nematic behaviour, followed on cooling by a smectic C phase for n = 4–7, and finally, a hexatic-type smectic X phase for n = 3–7. Mixtures with n = 8–10 exhibit a smectic A phase below the conventional nematic phase, and on further cooling, a biaxial smectic Ab phase and the same hexatic-type SmX phase. Supramolecular trimers, CB6OBA:CB6OS and CB6OBA:1OB6OS, formed between CB6OBA and dimeric stilbazoles [(E)-2-(4-[6-(4’-methoxy[1,1’-biphenyl]-4-yl)hexyl]oxyphenyl)ethenyl]pyridine (1OB6OS) or 4-[(E)-4’-(6-4-[(E)-2-(pyridin-4-yl)ethenyl]phenoxyhexyl)[1,1’-biphenyl]-4- carbonitrile (CB6OS), exhibit nematic and twist-bend nematic phases, and are the first hydrogen-bonded trimers consisting of unlike donor and acceptor fragments to do so.
Original languageEnglish
Article number175
Number of pages16
Issue number3
Early online date6 Mar 2020
Publication statusPublished - Mar 2020

Bibliographical note

The work was supported by the National Science Centre (Poland) under the grant no. 2016/22/A/ST5/00319.


  • liquid crystals
  • twist-bend nematic phase
  • hydrogen-bonding
  • supramolecular dimers
  • supramolecular trimers
  • spontaneous symmetry breaking
  • supramolecular liquid crystals
  • Supramolecular liquid crystals
  • Supramolecular trimers
  • Twist-bend nematic phase
  • Liquid crystals
  • Hydrogen-bonding
  • Spontaneous symmetry breaking
  • Supramolecular dimers


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