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O: Fachverband Oberflächenphysik
O 87: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures V
O 87.8: Vortrag
Donnerstag, 15. März 2018, 12:30–12:45, MA 004
Supramolecular nanopatterns of arylene-alkynylenes on HOPG: Insights from STM — •Stefan-S. Jester — Universität Bonn, Kekulé-Institut für Organische Chemie und Biochemie, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany.
Arylene-alkynylenes with sufficiently long alkyl/alkoxy side chains form self-assembled monolayers at the solid/liquid interface on graphite (HOPG). 2D crystal engineering relates the size and shape of the molecules with the lattice constants and symmetries of these supramolecular nanopatterns. Scanning tunneling microscopy provides a submolecularly resolved insight. Tesselation concepts can be applied to design cocrystals (e.g., of triangles and hexagons), and the symmetry mismatch between molecule and the substrate lattice leads to complex superstructures (e.g., observed for pentagons).[1] The hierarchical formation of frustrated superstructures is observed for C3v symmetric molecules, but still difficult to predict.[2] Thereby, not only the number of alkoxy side chains per molecule, but also the substitution pattern is crucial for the periodic pattern formation, as we show for molecular spoked wheels.[3] [1] S.-S. Jester, E. Sigmund, S. Höger J. Am. Chem. Soc. 2011, 133, 11062; [2] S.-S. Jester, E. Sigmund, L. Röck, S. Höger Angew. Chem. Int. Ed. 2012, 51, 8555; [3] A. Idelson, C. Sterzenbach, S.-S. Jester, C. Tschierske, U. Baumeister, S. Höger J. Am. Chem. Soc. 2017, 139, 4429.