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Molecular curvature, specific intermolecular interactions and the twist-bend nematic phase: the synthesis and characterisation of the 1-(4-cyanobiphenyl-40-yl)-6-(4-alkylanilinebenzylidene- 40-oxy)hexanes (CB6O.m)

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dc.abstract.enThe syntheses and characterisation of the first ten homologues of the 1-(4-cyanobiphenyl-40-yl)-6-(4-alkylanilinebenzylidene-40-oxy)hexanes (CB6O.m) are reported. All ten members of the series exhibit an enantiotropic nematic, N, phase, and a monotropic twist-bend nematic, NTB, phase. Only CB6O.10 shows a smectic phase. The assignment of both nematic phases was confirmed using X-ray diffraction. For short chain lengths (m = 1–6) the local packing in both nematic phases is an intercalated arrangement, for intermediate chain lengths a frustrated local structure is seen and for the longest chain length, a bilayer arrangement is observed. This change in the local structure on increasing m has no apparent effect on the stability of either nematic phase, and TNTBN and TNI show a regular dependence on m. Specifically, TNTBN and TNI decrease on increasing m and superimposed upon this is a weak odd–even effect in which the odd members show the higher values. TNI decreases more rapidly than TNTBN on increasing m such that the ratio TNTBN/TNI increases. The lower temperature liquid crystal phase shown by 1-(4-cyanobiphenyl-40-yloxy)-5-(4-butylanilinebenzylidene-40-oxy)pentane (CBO5O.4) is reassigned as a twist-bend nematic phase. The transitional properties of the CB6O.m, CB6O.Om and CBO5O.m series are compared.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorPociecha, Damian
dc.contributor.authorGórecka, Ewa
dc.contributor.authorStrachan, Grant J.
dc.contributor.authorStorey, John M. D.
dc.contributor.authorImrie, Corrie T.
dc.contributor.authorWalker, Rebecca
dc.date.accessioned2024-01-25T12:53:10Z
dc.date.available2024-01-25T12:53:10Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.description.number15
dc.description.volume15
dc.identifier.doi10.1039/C9SM00026G
dc.identifier.issn1744-683X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/112856
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofSoft Matter
dc.relation.pages3188-3197
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleMolecular curvature, specific intermolecular interactions and the twist-bend nematic phase: the synthesis and characterisation of the 1-(4-cyanobiphenyl-40-yl)-6-(4-alkylanilinebenzylidene- 40-oxy)hexanes (CB6O.m)
dc.typeJournalArticle
dspace.entity.typePublication