Supramolecular liquid crystals exhibiting a chiral twist-bend nematic phase

Rebecca Walker*, Damian Pociecha, Mirosław Salamończyk, John M.D. Storey, Ewa Gorecka, Corrie T. Imrie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
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A selection of novel, chiral supramolecular liquid crystals formed by hydrogen-bonding are reported and their phase properties characterised by polarised optical microscopy, X-ray diffraction and resonant soft X-ray diffraction. Their behaviour is compared to that of their achiral analogues. The binary mixture of the bent-shaped, non-mesogenic H-bond acceptor 1OB6OS and chiral H-bond donor (S)-(2-Me)4OBA exhibits chiral nematic (N∗) and chiral smectic A (SmA∗) phases. Doping the twist-bend nematogenic (NTB) complex 1OB6OS:4OBA with (S)-(2-Me)4OBA in ternary mixtures induces a transition from the N∗ phase to the chiral twist-bend nematic phase N∗TB, the first example seen in a supramolecular liquid crystal. The binary mixture of CB6OS and (S)-(2-Me)4OBA exhibits N∗ and N∗TB phases, with the helical structure of the latter having a periodicity of approximately 2 complex lengths (∼8 nm). The nature of the hydrogen bond is reversed in a binary mixture of the bent-shaped, twist-bend nematogen CB6OBA with (S)-(2-Me)4OBA, and this exhibits the phase sequence N∗-N∗TB-SmC∗-SmX. 

Original languageEnglish
Pages (from-to)1622-1630
Number of pages9
JournalMaterials Advances
Issue number6
Early online date2 Jul 2020
Publication statusPublished - 1 Sept 2020

Bibliographical note

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


RW gratefully thanks the Carnegie Trust for the Universities of Scotland for the award of a PhD Scholarship (2015–2018).


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