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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 44.6: Poster

Mittwoch, 28. März 2007, 17:00–19:30, Poster C

STM Investigations on the ordered layers of a Tricarbonyl-(triphenylene)chromium-complex on Ag(111) and Ag(100) — •Christoph Schmitz¹, Iordan Kossev¹, Carola Rang², Karl Heinz Dötz², and Moritz Sokolowski¹ — ¹Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, 53115 Bonn, Germany — ²Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany

Metal-organic complexes of chromium are interesting as catalysts and also in the role of molecular switches [1]. The switching, i.e., the reversible haptotropic migration of the chromium, has been extensively studied in solution [2]. However, possible technical applications require that the switching process occurs, when the substance is bonded on a surface or in the solid state. Here we show first STM investigations of a monolayer of such metal-organic complex on the Ag(111) and Ag(100) surfaces in ultra-high vacuum. The deposition of the substance was done by sublimation from a home build Knudsen cell. STM measurements at room temperature and low temperatures (80-100 K) reveal long-range ordered structures. Based on the unit cell geometry, the tunneling contrast, and DFT calculations we draw conclusions about the ordering of the molecules in the unit cell. The DFT calculations were kindly provided by Y. Su and F. Neese. This work is supported by DFG, SFB 624. [1] B. L. Feringa, (Ed.), Molecular Switches, Wiley-VCH, Weinheim (2001). [2] H. C. Jahr, M. Nieger and K. H. Dötz, Chemical Communications (2003) 2866.