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Design and investigation of de Vries liquid crystals based on 5-phenyl-pyrimidine and (R,R)-2,3-epoxyhexoxy backbone

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cris.lastimport.scopus2024-02-12T19:36:04Z
dc.abstract.enCalamitic liquid crystals based on 5-phenyl-pyrimidine derivatives have been designed, synthesized, and characterized. The 5-phenyl pyrimidine core was functionalized with a chiral (R,R)-2,3-epoxyhexoxy chain on one side and either siloxane or perfluoro terminated chains on the opposite side. The one involving a perfluorinated chain shows SmA* phase over a wide temperature range of 82 degrees C, whereas the siloxane analog exhibits both SmA* and SmC* phases over a broad range of temperatures, and a weak first-order SmA*-SmC* transition is observed. For the siloxane analog, the reduction factor for the layer shrinkage R (relative to its thickness at the SmA*-SmC* transition temperature, T-AC) is similar to 0.373, and layer shrinkage is 1.7\% at a temperature of 13 degrees C below the T-AC. This compound is considered to have ``de Vries smectic'' characteristics with the de Vries coefficient C-deVries of similar to 0.86 on the scale of zero (maximum-layer shrinkage) to 1 (zero-layer shrinkage). A three-parameter mean-field model is introduced for the orientational distribution function (ODF) to reproduce the electro-optic properties. This model explains the experimental results and leads to the ODF, which exhibits a crossover from the sugar-loaf to diffuse-cone ODF some 3 degrees C above T-AC.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorVij, J. K.
dc.contributor.authorPanov, A.
dc.contributor.authorStevenson, P. J.
dc.contributor.authorPanarin, Yu. P.
dc.contributor.authorSreenilayam, S. P.
dc.contributor.authorGórecka, Ewa
dc.contributor.authorRodriguez-Lojo, D.
dc.contributor.authorSwaminathan, V.
dc.contributor.authorPanov, V. P.
dc.date.accessioned2024-01-24T21:33:20Z
dc.date.available2024-01-24T21:33:20Z
dc.date.issued2017
dc.description.financeNie dotyczy
dc.description.number4
dc.description.volume96
dc.identifier.doi10.1103/PHYSREVE.96.042701
dc.identifier.issn2470-0045
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/104594
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofPhysical review. E
dc.relation.pages42701
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleDesign and investigation of de Vries liquid crystals based on 5-phenyl-pyrimidine and (R,R)-2,3-epoxyhexoxy backbone
dc.typeJournalArticle
dspace.entity.typePublication