Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Bio- and Molecular Magnetism
MA 27.5: Vortrag
Donnerstag, 28. Februar 2008, 15:30–15:45, EB 202
High-frequency ESR and frequency domain magnetic resonance spectroscopic studies of single molecule magnets in frozen solution — •Fadi El Hallak1, Joris van Slageren1, Martin Dressel1, Jordi Gómez-Segura2, and Daniel Ruiz-Molina2 — 11.Physikalsiches Institut, Universität Stuttgart, Stuttgart, Germany — 2Institut de Ciència de Materials de Barcelona, Bellaterra, Spain
Frozen solutions of the single molecule magnet Mn12-Pivalate (or trimethylacetate) are studied by magnetization and magnetic resonance investigations. AC magnetic susceptibility measurements show that the system is stable in solution. Interestingly, the barrier and prefactor for the thermally activated magnetization relaxation are the same as in the solid state. This means that this system is not influenced by its surroundings,in contrast to other Mn12 derivatives. The zero-field-splitting spin Hamiltonian parameters of Mn12Piv in solution are determined by magnetic resonance spectroscopy methods to be very similar to those in the solid state. By these methods, it is also possible to distinguish between truly dissolved and precipitated species, which is not possible by magnetization measurements.