Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)

O 42.4: Poster

Wednesday, March 25, 2009, 17:45–20:30, P2

Selective and Hierarchical Bonding Interactions in 2D Multi-Component Supramolecular Networks at Surfaces — •Alexander Langner¹, Steven L. Tait¹, Chandrasekar Rajadurai², Nian Lin¹, Mario Ruben², and Klaus Kern^1,3 — ¹Max-Planck-Institut für Festkörperforschung, Stuttgart — ²Institut für Nanotechnologie, Forschungszentrum Karlsruhe — ³Ecole Polytechnique Fédérale de Lausanne, Switzerland

Self-assembly of organic molecules is an efficient bottom-up approach to pattern surfaces with unique two-dimensional (2D) architectures at the nanometer scale. In order to achieve extended and highly ordered supramolecular networks, the spontaneous self-organization process has to be steered by selective, directional and strong, but non-covalent bonding interactions, such as hydrogen bonding or metal-organic complex formation. Here we concentrate on the surface supported self-assembly of aromatic ligand mixtures studied by scanning tunneling microscopy (STM) under ultra high vacuum (UHV) conditions. The various molecular building blocks are provided with either carboxylic acid or pyridyl moieties. In these ligand mixtures, selectivity of the functional groups towards different co-evaporated metal coordination centers is observed, which can lead to ligand separation or the formation of complex multi-component networks, stabilized by hierarchical bonding (i.e. hydrogen bonding as well as metal-ligand coordination). We will demonstrate that the selective and hierarchical character of the bonding interactions allow the controlled manipulation of structural network parameters.