Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)
O 44.18: Poster
Mittwoch, 28. März 2007, 17:00–19:30, Poster C
STM Observation of Molecular Chains consisting of Mn6Cr Single Molecule Magnets on Highly Ordered Pyrolytic Graphite (HOPG) — •Aaron Gryzia1, Armin Brechling1, Wiebke Hachmann1, Marc David Sacher1, Ulrich Heinzmann1, Maik Heidemeier2, and Thorsten Glaser2 — 1Faculty of Physics — 2Faculty of Chemistry, University of Bielefeld, D-33615 Bielefeld
We report on the preparation and characterization of Mn6Cr-Single Molecule Magnets1 on a HOPG(0001) surface.
The Mn6Cr-molecules showed 1D molecular arrangements with many interesting features, such as the occurrence of discrete kink angles in the molecular chains of 30∘, only two different molecular orientations, the orientation of the chains along the main crystal axis of HOPG and a much larger molecule-molecule distance than expected from the van der Waals radii of the molecules. The orientation of single Mn6Cr-molecules in the chain and the orientation of the chain, in respect to the main crystal axis of the HOPG substrate, shows a clear dependence. Segments of the chain with the same orientation of the Mn6Cr-molecules are parallel to the main crystal axis and parts with an alternating molecular orientation are tilted by 30∘ in respect to this axis, which is a clear evidence for molecular-substrate interactions.
The observed structures appear to be a very promising model system to study the competition between molecule-molecule interactions and substrate-molecule interactions.
1 T. Glaser et al., Angew. Chem., 118, 6179-6183 (2006).