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MA: Fachverband Magnetismus
MA 36: Molecular Magnetism and Magnetic Particles / Clusters I
MA 36.10: Vortrag
Mittwoch, 11. März 2026, 17:30–17:45, POT/0151
Probing the magnetic behavior of the metastable high-spin state achieved by light-induced excited spin-state trapping in Fe (II) spin-crossover complexes — •Sangeeta Thakur1, Marcel Walter1, Tarek Al Said2, Eike F. Kuhlemann3, Clara W. A. Trommer3, Torben Adam3, Karsten Holldack2, Felix Tuczek3, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany — 3Institut für Anorganische Chemie, Christian-Albrechts Universität zu Kiel, 24098 Kiel, Germany
The magnetic behavior of the metastable high-spin (HS) state of the Fe (II) complexes mononuclear [Fe(bpz)2(bipy)]; (bpz = dihydrobis(pyrazolyl)borate) and dinuclear [(Fe(bpz)2)2µ-(ac(bipy)2)] (ac(bipy)2 = bridging ligand) was investigated at 5 K by frequency-domain Fourier transform electron paramagnetic resonance (EPR) spectroscopy in a magnetic field of 1-10 T. The magnetic field map of the EPR measurements indicates a large value (70-90 cm−1) of zero-field splitting (ZFS) for the dinuclear and mononuclear complexes. Comparatively, the HS-locked complexes [Fe(H2B(pz)2)2(4,7-Me2-phen)] and [Fe(tris(3-Methylpyrazolyl)borate)2] exhibit values of ZFS around around 10-17 cm−1. The large ZFS obtained for the dinuclear and mononuclear complexes could be due to the contribution of spin-orbit coupling (SOC). To the best of our knowledge, this is the first time the spin Hamiltonian parameters for Fe (II) SCO complexes were investigated in the metastable HS state.
Keywords: Spin crossover complexes; XAS; LIESST