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Maranda-Niedbała, Agnieszka; Jaroch, Tomasz; Walker, Rebecca; Pięta, Piotr; Górecka, Ewa; Imrie, Corrie T.; Storey, John MD; Proń, Adam; Nowakowski, Robert, 2025, "STM and AFM images for supramolecular organization in monolayers of pyrene-functionalized asymmetric twist-bend nematic dimers", https://doi.org/10.18150/USMAAP, RepOD, V1
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2D supramolecular organization of asymmetric liquid crystal dimers containing two chemically different mesogenic groups, namely: cyanobiphenyl and pyreneiminomethyl phenoxy groups, linked with an oligomethylene linker of different length (6 or 8 -CH2- units), was studied using scanning tunneling microscopy (STM). For this purpose, monolayers of these dimers were deposited on a HOPG substrate from their solutions in hexane by drop-casting and imaged at nanometer resolution after drying. A detailed discussion of two possible different supramolecular organizations is presented. Comparative analysis of the monolayer structure with already reported XRD data on 3D organization of the same molecules in a single crystal revealed significant differences resulting from: i) different ordering preferences in 2D and 3D systems and ii) effect of the interactions of the deposited molecules with the graphite substrate.
liquid crystal dimers, pyrene, cyanobiphenyl, scanning tunneling microscopy, self-assembly, supramolecular organization
Agnieszka Maranda-Niedbała, Tomasz Jaroch, Rebecca Walker, Piotr Pięta, Ewa Górecka, Corrie T Imrie, John MD Storey, Adam Proń, and Robert Nowakowski; Supramolecular Organization in Monolayers of Pyrene-Functionalized Asymmetric Twist-Bend Nematic Dimers: Comparison with a Three-Dimensional Crystal Structure; Langmuir 2025 41 (14), 9508-9519 https://doi.org/10.1021/acs.langmuir.5c00551 doi: 10.1021/acs.langmuir.5c00551
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