Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Supramolecular Aggregates
CPP 1.5: Vortrag
Montag, 26. März 2007, 11:00–11:15, H37
Selective mapping of the coordinate metal bonds in supramolecular nanoarchitectures — •P. Müller1, M.S. Alam1, L.K. Thompson2, U. Kortz3, R. Saalfrank4, M. Ruben5, and J.-M. Lehn6 — 1Physikalisches Institut III, Universität Erlangen-Nürnberg — 2Chemistry Department, Memorial University, St. Johns, Canada — 3School of Engineering and Science, International University, Bremen — 4Institut für Organische Chemie, Universität Erlangen-Nürnberg — 5Institut für Nanotechnologie, FZ Karlsruhe — 6ISIS, Université Louis Pasteur, Strasbourg, France
Coordinate-bonded 3d metal ions dominate the electronic density of states of organic molecules incorporating such metal centers. Supramolecular nanostructures of different structural complexity and incorporating different transition metal ions were investigated. The molecules were deposited from the solution onto HOPG surfaces. The structural and electronic properties were studied at the single-molecule level by STM and current imaging tunneling spectroscopy (CITS). This spectroscopy was applied to different types of square and star-like metal ion arrays, a supramolecular copper-oxygen assembly embedded into a polyoxotungstate wheel, and a coordination polymer based on amino acids, rendering local tunneling probabilities with submolecular resolution. These investigations allowed the localization of the positions of the incorporated transition metal centers due to a selective mapping of the coordinate metal-ligand bonds. CITS measurements of a one-dimensional, Fe containing polymer revealed a high contrast between the high-spin and the low-spin complexes.