SAMOP 2021 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Poster 1
MO 7.16: Poster
Donnerstag, 23. September 2021, 17:30–19:30, P
Magnetic properties and their correlation to the electronic ground states of isolated trinuclear 3d spin frustrated complexes — •Michael Lembach1, Johannes Lang1, Maximilian Luczak1, Yannick Mees1, Roumany Israil1, Vicente Zamudio-Bayer2, Martin Timm2, Christine Bülow2, Bernd von Issendorff4, Akira Terasaki3, Christoph Riehn1, Tobias Lau2, and Gereon Niedner-Schatteburg1 — 1Technische Universität Kaiserslautern, Kaiserslautern, Germany — 2Helmholtz-Zentrum für Materialien und Energie, Berlin, Germany — 3Kyushu University, Fukuoka, Japan — 4Physikalisches Institut, Freiburg, Germany
Transition metal complexes often reveal extraordinary magnetic properties. In this case an assembly of spins located on an assembly of atoms cannot arrange their orientation in a way they can profit from the magnetic interaction with the neighbored spin. The electronics of [Fe3O(CH3CO2)6L0-3]+ (L = pyridine) complexes are extremely sensitive to intrinsic geometric distortions of the M3O core induced by the bridging ligands and/or the axial ligands. We probe the magnetic moments and electronic transitions of these trinuclear complexes via X-Ray Magnetic Circular Dichroism (XMCD) and Ultra Violet Photon dissociation (UVPD) spectra as isolated molecule, to rule out packing effects or bulk ordering. Combining these techniques reveals that the coordination of axial pyridine ligands to the complex disturbs the triangular geometry of the Fe3O core with a change in the ground state electronic structure and the magnetic exchange coupling.