Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.74: Poster
Montag, 9. März 2026, 09:30–12:30, P2
Electron paramagnetic resonance and magnetization studies on tetrahedral CoII complexes — •Matthias Heinrich1, Jan Arneth1, Amit Gharu2, Kuduva Vignesh2, and Rüdiger Klingeler1 — 1Kirchhoff Institute for Physics, Heidelberg University, Germany — 2Department of Chemical Sciences, IISER Mohali, India
We report the static and dynamic magnetic properties of a series of five cobalt complexes of the type Co4IIICoII with four octahedrally coordinated CoIII centers in the low-spin S=0 state and a magnetically isolated CoII ion (S = 3/2) in distorted tetrahedral coordination. The tetrahedral distortion differs across the series due to variations in bond lengths and bond angles. Our static and dynamic magnetization measurements of all compounds reveal field-induced magnetic relaxation as well as pronounced magnetic anisotropy. For one representative complex, high-field EPR-studies are presented which allow to determine the anisotropic g-factor as well as the easy-plane anisotropy. The effect of tetrahedral distortion on the magnetic anisotropy is quantitatively evaluated and discussed.
Keywords: High-Field Electron Paramagnetic Resonance; Single-molecule Magnets