Parts | Days | Selection | Search | Downloads | Help
MA: Fachverband Magnetismus
MA 2: Bio- and Molecular Magnetism
MA 2.9: Talk
Monday, March 22, 2010, 12:45–13:00, H10
Preparation and characterization of Mn6Cr single-molecule-magnets on surfaces — •Marc Sacher1, Andreas Helmstedt1, Aaron Gryzia1, Peter Koop1, Sebastian Steppeler1, Norbert Müller1, Armin Brechling1, Ulrich Heinzmann1, Veronika Höke2, Thorsten Glaser2, Mikhail Fonin3, and Ulrich Rüdiger3 — 1Fak. f. Physik, Uni Bielefeld — 2Fak. f. Chemie, Uni Bielefeld — 3Fak. f. Physik, Uni Konstanz
The single-molecule-magnet (SMM) Mn6Cr consists of two bowl-shaped Mn3-salen complexes, bridged by a complex containing a Cr atom. Three counterions are coupled to the SMM to ensure charge neutrality. To study the influence of the molecule-substrate-interaction on the electronic and the magnetic properties a homogeneous preparation of the SMM on the substrate is necessary. The preparation is done by dropping SMM, dissolved in methanol with certain concentration. Depending on the choice of the substrate, the Mn6Cr concentration, the substrate inclination and the droplet size the arrangement of the SMM strongly varies. This will be visualized in videos of the drying process obtained by optical microscopy with a magnification of up to 1000. The electronic properties of the deposited SMM are investigated by X-ray absorption spectroscopy. These properties change with exposure time due to a low stability of the SMM against X-rays. These changes can be accelerated or slowed down via the choice of the counterions and the SMM concentration on the substrate. Possible reasons will be discussed.