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O: Oberflächenphysik

O 39: Nanostructures III

O 39.6: Vortrag

Donnerstag, 30. März 2006, 16:15–16:30, PHY C213

Low-dimensional Supramolecular Structures by Design — •Nian Lin, Sebastian Stepanow, Dietmar Payer, Steve Tait, and Klaus Kern — Max-Planck-Institute for Solid State Research

Supramolecular chemistry provides powerful methodologies for the controlled generation of nanostructures following bottom-up fabrication principles. Here we present our systematic studies using surfaces as platforms to direct the assembly of novel low-dimensional supramolecular structures. The flexibility of the underlying non-covalent interactions, e.g., H-bond, ionic bond and metal-coordination, facilitates the formation of thermal equilibrium structures. We demonstrate that the information stored in the individual molecular building blocks, e.g., end groups, backbone symmetry, geometry and chemistry, can be transferred to the supramolecular organization level. As the first example we will show that by specific element substituation at the molecular backbones, one may steer 1D vs. 2D growth. Furthermore chiral organization can be controlled by modifying the molecular backbone symmetry. Then we will demonstrate that open network structures of tunable pore geometry can be obatined through careful selection of molecular structure and interamolecular binding modes. The chemistry and morphology of the surpporting surfaces are found to be important in determining the final strcutures. The surface-supported supramolecular systems represent promising materials for potential applications, e. g., in nano-patterning, surface templating, low-dimensional magnetic systems, heterogenous catalysis, sensing or molecular recognition.