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H-Shape mesogenic dimers-the spacer parity effect

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dc.abstract.enIt was found that for H-shape dimers, the parity of the number of atoms in the spacer linking the mesogenic cores has important influence on the mesogenic properties only for the molecules with weak mesogenic core anisotropy. In the case of stronger core anisotropy, the parallel arrangement of mesogenic units is induced regardless of the spacer parity. As a result, phase transition temperatures and layer spacing are only weakly affected by spacer parity. By studying the properties of six new homologue series it was found that for H-shape dimers the orthogonal smectic (SmA) is strongly disfavoured: most compounds form a tilted smectic (SmC) phase, which is related to hindrances in molecular rotation for molecules with large breath to length ratio. For dimers with very long spacer, and thus decoupled mesogenic units, the smectic phase is replaced by a nematic phase, and for stiff polycatenar molecules with very short spacers the cubic phase can appear.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKolpaczynska, Milena
dc.contributor.authorPociecha, Damian
dc.contributor.authorWolska, Joanna
dc.contributor.authorMieczkowski, Józef
dc.contributor.authorGórecka, Ewa
dc.date.accessioned2024-01-25T03:30:41Z
dc.date.available2024-01-25T03:30:41Z
dc.date.copyright2017-04-07
dc.date.issued2017
dc.description.accesstimeAT_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number33
dc.description.versionFINAL_PUBLISHED
dc.description.volume7
dc.identifier.doi10.1039/C7RA02730C
dc.identifier.issn2046-2069
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/108719
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofRSC Advances
dc.relation.pages20354-20359
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleH-Shape mesogenic dimers-the spacer parity effect
dc.typeJournalArticle
dspace.entity.typePublication