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O: Fachverband Oberflächenphysik

O 87: Focussed Session: Solid-liquid Interfaces III

O 87.4: Vortrag

Freitag, 15. März 2013, 11:15–11:30, H31

Surface patterning by molecular polygons and stars: Designed 2D nanoarchitectures at the solid/liquid interface imaged by STM — •Stefan-S. Jester, Eva Sigmund, Nina Schönfelder, Lisa M. Röck, and Sigurd Höger — Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany

The self-assembly of shape-persistent organic molecules at the solution/solid interface is an efficient bottom-up approach towards predictable 2D architectures. Scanning tunneling microscopy yields a submolecularly resolved insight into the monolayer structures. How do the nanoscale patterns - here: supported on graphite - depend on the shapes, sizes, and substituents of the adlayer building blocks? We recently focused on molecular polygons (triangles, squares, pentagons, and hexagons) with dithiophene corners and phenylene-alkynylene sides, as well as on molecular stars, polycyclic heteroaromatic hydrocarbons for which frustrated self-assembly leads to hierarchically organized superstructures with unit cells of up to 20 molecules. In my talk I will give insight into the relation between discrete geometry and supramolecular adlayers, show cocrystals of triangles and hexagons, and explain how large periodicities beyond 10 nm become accessible.

[1] S.-S. Jester, N. Shabelina, S. M. Le Blanc, S. Höger, Angew. Chem. Int. Ed. 2010, 49, 6101. [2] S.-S. Jester, E. Sigmund, S. Höger, J. Am. Chem. Soc. 2011, 133, 11062. [3] S.-S. Jester, E. Sigmund, L. M. Röck, S. Höger, Angew. Chem. Int. Ed. 2012, 51, 8555.