Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Molecular Nanostructures

O 59.7: Vortrag

Donnerstag, 28. Februar 2008, 11:00–11:15, MA 041

Template Readout of Hierarchical Coordination Networks at Surfaces — •Alexander Langner¹, Steven L. Tait¹, Nian Lin¹, Chandrasekar Rajadurai², Mario Ruben², and Klaus Kern^1,3 — ¹Max-Planck-Institut für Festkörperforschung, Stuttgart — ²Forschungszentrum Karlsruhe GmbH — ³Ecole Polytechnique Fédérale de Lausanne, Switzerland

Self-assembly of organic molecules into supramolecular networks is an efficient strategy to pattern surfaces with functional nanostructures. Highly ordered architectures can be achieved if the spontaneous self-organization process is steered by selective and directional non-covalent interactions. Here we demonstrate that from a mixture of organic ligands, several unique structures can be "read out" by adjusting the external environment of the mixture. We report on the self-organization of mixtures of multiple ligands with metal atoms at the Cu(100) surface under ultra high vacuum (UHV) conditions. The generated architectures exhibit a hierarchy of supramolecular interactions: highly stable metal-organic coordination bonding and somewhat weaker hydrogen bonding. With scanning tunneling microscopy (STM) we demonstrate that modification of external parameters, e.g. commensurability with substrate or introduction of guest molecules, causes distinct structural configurations for identical ligand binding units, even leading in some cases to complete ligand segregation. Due to the hierarchy of bonding strengths, it is possible to modify only the lower level of structural organization resulting in new metal-organic architectures with identical primary structural units.