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Remarkable smectic phase behaviour in odd-membered liquid crystal dimers: the CT6O.m series

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dc.abstract.enThe syntheses and characterisation of the first ten homologues of the (34-[6-(4-{(E)-[(4-alkylphenyl)imino]methyl}phenoxy)-hexyl][11,21:24,31-terphenyl]-14-carbonitriles (CT6O.m) are reported. Below the conventional nematic phase, N, a rich smectic polymorphism is observed. CT6O.mhomologues withm= 1-9 show a series of up to four smectic phases, namely: an intercalated biaxial smectic Abphase, a modulated phase made of tilted biaxial SmC layer fragments, a non-tilted biaxial hexatic-type phase termed the SmX phase, and a soft crystalline lamellar phase, SmY. The longest homologue, CT6O.10, exhibits a different sequence of smectic phases below the N phase: an uniaxial SmA phase, a biaxial SmAbphase, a tilted SmC phase, and the soft crystalline SmY phase. The assignment of these phases was confirmed using a combination of polarised optical microscopy, X-ray diffraction and optical birefringence studies. In CT6O.10 only the SmC has an intercalated structure of molecules; while the smectic phases either side show interdigitated molecular packing arrangement. The strong biaxiality of the SmC phase results in an unusual switching mode detected under the application of an electric field, in which by coupling the dielectric anisotropy with the electric field, molecules in cells with planar anchoring reorient to give an optical texture without tilt domains, and the switching is accompanied by a considerable increase in the measured birefringence.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorImrie, Corrie T.
dc.contributor.authorPociecha, Damian
dc.contributor.authorGórecka, Ewa
dc.contributor.authorWalker, Rebecca
dc.contributor.authorStorey, John M. D.
dc.date.accessioned2024-01-25T19:11:12Z
dc.date.available2024-01-25T19:11:12Z
dc.date.copyright2021-04-21
dc.date.issued2021
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number15
dc.description.versionFINAL_PUBLISHED
dc.description.volume9
dc.identifier.doi10.1039/D1TC00904D
dc.identifier.issn2050-7534
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/118358
dc.identifier.weblinkhttp://pubs.rsc.org/en/content/articlepdf/2021/TC/D1TC00904D
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofJournal of Materials Chemistry C
dc.relation.pages5167-5173
dc.rightsCC-BY-NC
dc.sciencecloudnosend
dc.titleRemarkable smectic phase behaviour in odd-membered liquid crystal dimers: the CT6O.m series
dc.typeJournalArticle
dspace.entity.typePublication