Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.79: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Probing the magnetic behavior of the metastable high-spin state achieved by light-induced excited spin-state trapping in Fe (II) complexes — •Marcel Walter1, Tarek Al Said2, Clara W.A. Trommer3, Torben Adam3, Felix Tuczek3, Karsten Holldack2, Wolfgang Kuch1, and Sangeeta Thakur1 — 1Freie Universität Berlin, Institut für Experimentalphysik, 14195 Berlin, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 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 binuclear iron complex [(Fe(H2B(pz)2)2)2 (µ-bipy-ac-bipy)] and the mononuclear complex [Fe(H2B(pz)2)2(bipy)] was investigated at 5 K by electron paramagnetic resonance (EPR) spectroscopy in a magnetic field of 1-10 T. The relaxation time of the spins from the low-spin state to reach the metastable HS state after light-induced excited spin state trapping is faster for the binuclear complex (11 min) as compared to the mononuclear complex (16 min). The spin Hamiltonian parameters obtained from a simulation of the magnetic field map of the EPR measurements indicate a large value of zero-field splitting (ZFS) for both complexes, which can be explained by the contribution of spin-orbit coupling to the ZFS during the decay of the excited singlet states 1T1g to the excited 5T2g metastable HS state.
Keywords: Spin Crossover Complexes