Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 17: Semiconductor Substrates

O 17.8: Talk

Monday, March 31, 2014, 17:45–18:00, PHY C 213

Frustrated self-assembly of shape-persistent star molecules on HOPG — •Stefan-S. Jester, Eva Sigmund, Lisa M. Röck, and Sigurd Höger — Universität Bonn, Kekulé-Institut für Organische Chemie und Biochemie, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany

Star-shaped organic molecules with a rigid backbone and flexible side chains adsorb at the solution/solid interface to form self-assembled 2D nanopatterns. Scanning tunneling microscopy yields a submolecularly resolved insight into the adsorbate structures and thus an insight on the driving forces of their formation. We investigate the role of alkoxy side chain length on the adsorption patterns: Different dense and porous adsorbate patterns are observed, and for chain length n = 12, 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. [1] S.-S. Jester, E. Sigmund, L. M. Röck, S. Höger Angew. Chem. Int. Ed. 2012, 51, 8555.