Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.3: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Mixed-valent maganese high-spin complexes studied by X-ray spectroscopy methods — •Miriam Baensch¹, Manuel Prinz¹, Christian Taubitz¹, Karsten Kuepper², Andreas Scheurer³, Stefan Sperner³, Rolf W. Saalfrank³, Andrei Postnikov⁴, and Manfred Neumann¹ — ¹University of Osnabrück, Fachbereich Physik, D-49069 Osnabrück — ²University of Ulm, Institut für Festkörperphysik, D-89069 Ulm — ³Universität Erlangen Nürnberg, Department Chemie und Pharmazie, D-91058 Erlangen — ⁴Paul Verlaine University, Institute de Physique Electronique et Chimie, 1 Bd Arago, F-57078 Metz, France

The investigations of transition metal containing polynuclear complexes are of current interest due to their relevance to various research areas like bioinorganic chemistry, molecular magnetism and catalysis. There are several manganese containing complexes comprising mixed-valent Mn ions, e.g. Mn₁₂^III/IV-acetate, the wheel-shaped Mn₁₂^II/III and Mn₇^II/III molecules. For the investigation of the electronic and magnetic structure of those mixed-valent high-spin complexes, it is important to have reference spectra of homonuclear manganese clusters with different Mn valencies. We present our X-ray spectroscopic and theoretical investigations of homo- and mixed-valent molecules, including X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS), density functional theory and charge transfer multiplet model (CTM) calculations. We discuss the wheel-shaped, mixed-valent Mn₁₂ and Mn₇ complexes using our pure Mn^II and Mn^III reference spectra of the Mn^IIStar, and Mn₆^IIISalox compounds.