Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)

O 58.10: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

Hierarchical self-assembly of polycyclic heteroaromatic stars into snowflake patterns: A route towards very large lattice constants — •Stefan-S. Jester, Eva Sigmund, Lisa M. Röck, and Sigurd Höger — Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany

The self-assembly of rigid molecules with long alkyl/alkoxy side chains at the solution/solid interface allows an efficient approach towards 2D supramolecular crystalline surface patterns.[1,2] Scanning tunneling microscopy yields a submolecularly resolved insight into the adlayer structures and thus a conclusion on the driving forces for their formation. Of particular interest is how the nanoscale architectures depend on the design of the molecules, and how large unit cells can be derived. Here we present the two-dimensional self-assembly of polycyclic heteroaromatic star molecules with alkoxy side chains of distinct lengths on graphite. Depending on the chain length different dense and porous adsorbate patterns are observed. For n = 12 the frustrated self-assembly leads to hierarchically organized superstructures. Up to 10 molecules form triangular aggregates which pack densely into hexagonal patterns with very large (15.5 nm) lattice constants.[3]

[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.