Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.48: Poster
Tuesday, March 15, 2011, 18:30–22:00, P4
Rational design of two-dimensional metal-organic frameworks for functional catalysis — •Christopher Kley1, Jan Cechal1, Takashi Kumagai1, Frank Schramm2, Sebastian Stepanow1, Mario Ruben2, and Klaus Kern1,3 — 1Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany — 2Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany — 3École Polytechnique Fédérale de Lausanne, Institut de Physique de la Matière Condensée, 1015 Lausanne, Switzerland
The prospect of tailored metal-organic frameworks (MOF) by rational design makes them attractive candidates for functional structures. Here, we perform surface-confined bimetallic coordination with organic ligands to build-up two-dimensional MOFs with metal rich nanopores for heterogenous catalysts. We study the self-assembly and metal coordination of a rod-like organic ligand with transition metal atoms on Cu and Ag surfaces. The ligand comprises carboxylic and alkynyl functionalities for the selective binding of metal centers. By means of variable temperature scanning tunneling microscopy we observed substrate induced conformational changes of the organic molecule with strong molecular relaxations on the Cu(100) surface. Regular and open metal-coordination networks have been obtained with Fe centers coordinating preferably to the carboxylate oxygen atoms, while Ni atoms tend to bind to the alkynyl groups. This allows for the rational design of bimetallic coordination networks comprising different metal atoms for the structural and catalytic properties at surfaces.