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MA: Fachverband Magnetismus

MA 6: Molecular Magnetism

MA 6.4: Talk

Monday, March 18, 2024, 10:30–10:45, EB 301

High-field/high-frequency electron paramagnetic resonance studies on a muffin-shaped Er(III) complex — •Birte Beier¹, Jan Arneth¹, Gerlinde Greif², Peter Roesky², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, Heidelberg University, Germany — ²Institute for inorganic chemistry, Karlsruhe Institute for Technology, Germany

Quantitative determination of magnetic anisotropy and the energy level diagram in 4f monomeric complexes is key to design appropriate crystalline environments of the magnetic centers. Here, we report high-field/high-frequency electron paramagnetic resonance spectroscopy (HF-EPR) and magnetisation studies on the phenantrolin-pyridin-triazol (PPT) complex [Er(PPTMP)₂(MeOH)][OTf]₃x3MeOH which is characterised by a muffin-shaped first coordination sphere. Our observation of a Kramer’s doublet with g_eff=8.5(4) implies a m = 7/2 ground state doublet of the 9-fold coordinated Er(III) ion. This conclusion is further supported by high-field magnetisation data. The absence of inter doublet transitions indicates that the gap to the first excited Kramers doublet exceeds 550 GHz. The anisotropic effective g-factors are compared with numerical studies and discussed with respect to related Er(III) complexes.

Keywords: Single Molecular Magnets; Single Ion Magnet; 4f-Magnetism; High-Field Electron Paramagnetic Resonance