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Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Supramolecular Aggregates

CPP 1.5: Talk

Monday, March 26, 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. Lehn61Physikalisches 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.

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