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Dostęp zamkniętyHydrogen bonding and the design of twist-bend nematogens
| dc.abstract.en | The phase properties of equimolar mixtures consisting of a hydrogen bond donor, a 4-alkoxybenzoic acid (nOBA), and one of two different stilbazole-based hydrogen bond acceptors, either 4-[(E)-2-(4-{[6-(4′-methoxy[1,1′-biphenyl]-4-yl)hexyl]oxy}phenyl)-ethenyl]-pyridine (1OB6OS) or 4-[(E)-4′-(6-{4-[(E)-2-(pyridin-4-yl)ethenyl]phenoxy}hexyl)-[1,1′-biphenyl]-4-carbonitrile (CB6OS) are reported. Neither hydrogen bond acceptor exhibits liquid crystal behaviour whereas the nOBA compounds show smectic and/or nematic behaviour depending on the length of the alkyloxy chain. For the complexes of an nOBA with n = 1–5, both conventional nematic and twist-bend nematic phases were observed, while for n ≥ 6 smectic phases emerged and the twist-bend nematic phase was extinguished. The CB6OS-nOBA mixtures may exhibit the heliconical smectic CTB phase. The local molecular arrangement in the two sets of mixtures are similar and changes on increasing n but this is not reflected in the nematic-isotropic transition temperatures. Birefringence studies of the mixtures are reported. In general the behaviour of the hydrogen-bonded mixtures is similar to that of their covalently bonded counterparts. |
| dc.affiliation | Uniwersytet Warszawski |
| dc.contributor.author | Pociecha, Damian |
| dc.contributor.author | Imrie, C.T. |
| dc.contributor.author | Storey, J.M.D. |
| dc.contributor.author | Crawford, C.A. |
| dc.contributor.author | Walker, R. |
| dc.contributor.author | Górecka, Ewa |
| dc.date.accessioned | 2024-01-25T03:31:38Z |
| dc.date.available | 2024-01-25T03:31:38Z |
| dc.date.issued | 2020 |
| dc.description.finance | Publikacja bezkosztowa |
| dc.description.volume | 303 |
| dc.identifier.doi | 10.1016/J.MOLLIQ.2020.112630 |
| dc.identifier.issn | 0167-7322 |
| dc.identifier.uri | https://repozytorium.uw.edu.pl//handle/item/108788 |
| dc.language | eng |
| dc.pbn.affiliation | chemical sciences |
| dc.relation.ispartof | Journal of Molecular Liquids |
| dc.relation.pages | 112630 |
| dc.rights | ClosedAccess |
| dc.sciencecloud | nosend |
| dc.title | Hydrogen bonding and the design of twist-bend nematogens |
| dc.type | JournalArticle |
| dspace.entity.type | Publication |