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Twist‐bend nematic glasses: the synthesis and characterisation of pyrene‐based nonsymmetric dimers

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dc.abstract.enA selection of pyrene-based liquid crystal dimers have been prepared, containing either methylene-ether or diether-linked spacers of varying length and parity. All the diether linked materials, CBOnO.Py (n=5, 6, 11, 12), exhibit conventional nematic and smectic A phases, with the exception of CBO11O.Py which is exclusively nematic. The methylene-ether linked dimer, CBnO.Py, with an evenmembered spacer (n=5) was solely nematogenic, but odd-members (n=6, 8, 10) exhibited both nematic and twist-bend nematic phases. Replacement of the cyanobiphenyl fragment by cyanoterphenyl giving CT6O.Py, gave elevated melting and nematic-isotropic transition temperatures, and SmA and SmCA phases were observed on cooling the nematic phase. Intermolecular face-to-face associations of the pyrene moieties drive glass formation, and all these materials have a glass transition temperature at or above room temperature. The stability of the glassy twist-bend nematic phase allowed for its study using AFM, and the helical pitch length, PTB, was measured as 6.3 and 6.7 nm for CB6O.Py and CB8O.Py, respectively. These values are comparable to the shortest pitch of a twist-bend nematic phase measured to date.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorWalker, Rebecca
dc.contributor.authorMajewska, Magdalena
dc.contributor.authorPociecha, Damian
dc.contributor.authorMakal, Anna
dc.contributor.authorStorey, John MD
dc.contributor.authorGórecka, Ewa
dc.contributor.authorImrie, Corrie T.
dc.date.accessioned2024-01-26T11:08:09Z
dc.date.available2024-01-26T11:08:09Z
dc.date.issued2021
dc.description.financePublikacja bezkosztowa
dc.description.number5
dc.description.volume22
dc.identifier.doi10.1002/CPHC.202000993
dc.identifier.issn1439-4235
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123925
dc.identifier.weblinkhttps://onlinelibrary.wiley.com/doi/pdf/10.1002/cphc.202000993
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofChemPhysChem
dc.relation.pages461-470
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleTwist‐bend nematic glasses: the synthesis and characterisation of pyrene‐based nonsymmetric dimers
dc.typeJournalArticle
dspace.entity.typePublication