Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)

O 18.32: Poster

Montag, 25. Februar 2008, 18:30–19:30, Poster F

STM/STS Analysis of Molecular Chains Consisting of Mn₆Cr Single Molecule Magnets and Single Molecules on Highly Ordered Pyrolytic Graphite (HOPG) — •Aaron Gryzia¹, Armin Brechling¹, Wiebke Hachmann¹, Marc D. Sacher¹, Ulrich Heinzmann¹, Maik Heidemeier², and Thorsten Glaser² — ¹Molecular and Surface Physics, Bielefeld University — ²Anorganic Chemistry I, Bielefeld University

We report on the preparation and characterization of Mn₆Cr-Single Molecule Magnets on a HOPG(0001) surface.

The Mn₆Cr-molecules show 1D molecular arrangements with many interesting features, such as the occurrence of discrete kink angles in the molecular chains of 30 deg., only two different molecular orientations, the orientation of the chains along the main crystal axis of HOPG and much larger molecule-molecule distances than expected from the van der Waals radii of the molecules. By STS we characterized Mn₆Cr, thus gaining information on the electronic levels of the molecule and the shift of the levels whether it is part of a chain or not. One of our goals is to obtain data about the exact orientation of the molecule in respect to the surface; thus we can make a statement for the physical interaction why the molecules are assembling in chains. First results of these measurements will be presented.