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Supramolecular organization of liquid-crystal dimers – bis-cyanobiphenyl alkanes on HOPG by scanning tunneling microscopy

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dc.abstract.en2D supramolecular organization of a series of six cyanobiphenyls bimesogens deposited on highly oriented pyrolytic graphite (HOPG) is studied by scanning tunneling microscopy (STM). The adsorbates are 1,-bis(4-cyanobiphenyl-4-yl)alkanes (CBnCB) with different lengths of their flexible alkyl spacer (containing from 7 to 12 methylene groups). Microscopic investigations at the molecular resolution allow for detailed analysis of the effect of the alkyl spacer length on the type and the extent of the resulting 2D organization. It was demonstrated that bimesogens with shorter spacers (7 and 8 methylene units) organize in a similar manner characterized by the formation of two types of differently ordered monolayers: dense packed, wherein the molecules are oriented in one direction and ordered into parallel rows (layer structure), or less densely packed where they are organized into a chiral windmill-like structure. For derivatives with longer spacers (ranging from 9 to 12 methylene units) the additional effect of parity of carbon atoms in the spacer (even versus odd) is observed. In this range of the spacer lengths even membered bimesogens are also organized in a typical layer structure. However, odd-membered dimers exhibit a much more complex 2D supramolecular organization with a larger unit cell and a helical arrangement of the molecules. Careful comparison of this structure with the 3D structural data derived from the X-ray diffraction investigations of single crystals indicates that for these bimesogens a clear correlation exists between the observed complex 2D supramolecular organization in the monolayer and the organization in one of the crystallographic planes of the 3D nematic twist-bent phase.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorPron, Adam
dc.contributor.authorMehl, Georg H.
dc.contributor.authorMaranda-Niedbała, Agnieszka
dc.contributor.authorJaroch, Tomasz
dc.contributor.authorNowakowski, Robert
dc.contributor.authorKrzyżewska, Klaudyna
dc.contributor.authorWelch, Chris
dc.contributor.authorAhmed, Ziauddin
dc.contributor.authorPociecha, Damian
dc.contributor.authorGórecka, Ewa
dc.date.accessioned2024-01-26T09:24:55Z
dc.date.available2024-01-26T09:24:55Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.number34
dc.description.volume10
dc.identifier.doi10.1039/C8NR02069H
dc.identifier.issn2040-3364
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/121165
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofNanoscale
dc.relation.pages16201-16210
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enBEND NEMATIC PHASE
dc.subject.enMOLECULAR ALIGNMENT
dc.subject.enNANOSCALE-PITCH
dc.subject.enMESOPHASES
dc.subject.enPOLYMERS
dc.subject.enDERIVATIVES
dc.subject.enBIMESOGENS
dc.subject.enOLIGOMERS
dc.subject.enMIXTURES
dc.subject.enTRIMERS
dc.titleSupramolecular organization of liquid-crystal dimers – bis-cyanobiphenyl alkanes on HOPG by scanning tunneling microscopy
dc.typeJournalArticle
dspace.entity.typePublication