A Three-Pronged Attack To Investigate the Electronic Structure of a Family of Ferromagnetic Fe4Ln2 Cyclic Coordination Clusters: A Combined Magnetic Susceptibility, High-Field/High-Frequency Electron Paramagnetic Resonance, and57Fe M&ouml;ssbauer Study

Schmidt Sebastian F.M.; Koo Changhyun; Meriakre V.; Park Jaena; Heermann Dieter W.; Kataev Vladislav; Anson Christopher E.; Prodius Denis; Novitsky Ghenadie; Klingeler  Rudiger; Powell Annie Katherine

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SCHMIDT, Sebastian F.M., KOO, Changhyun, MERIAKRE, V., PARK, Jaena, HEERMANN, Dieter W., KATAEV, Vladislav, ANSON, Christopher E., PRODIUS, Denis, NOVITSKY, Ghenadie, KLINGELER, Rudiger, POWELL, Annie Katherine. A Three-Pronged Attack To Investigate the Electronic Structure of a Family of Ferromagnetic Fe4Ln2 Cyclic Coordination Clusters: A Combined Magnetic Susceptibility, High-Field/High-Frequency Electron Paramagnetic Resonance, and57Fe Mössbauer Study. In: Inorganic Chemistry, 2017, vol. 56, pp. 4796-4806. ISSN 0020-1669. DOI: https://doi.org/10.1021/acs.inorgchem.6b02682

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Inorganic Chemistry

Volumul 56 / 2017 / ISSN 0020-1669

A Three-Pronged Attack To Investigate the Electronic Structure of a Family of Ferromagnetic Fe₄Ln₂ Cyclic Coordination Clusters: A Combined Magnetic Susceptibility, High-Field/High-Frequency Electron Paramagnetic Resonance, and⁵⁷Fe Mössbauer Study

DOI:https://doi.org/10.1021/acs.inorgchem.6b02682

Pag. 4796-4806

Schmidt Sebastian F.M.¹, Koo Changhyun², Meriakre V.³, Park Jaena², Heermann Dieter W.², Kataev Vladislav⁴, Anson Christopher E.¹, Prodius Denis⁵, Novitsky Ghenadie⁶, Klingeler Rudiger¹, Powell Annie Katherine¹

¹ Karlsruhe Institute of Technology, Institute of Nanotechnology,
² University of Heidelberg,
³ Karlsruher Institut Fuer Technologie,
⁴ Leibniz Institute for Solid State and Materials Reseach, Dresden,
⁵ Institute of Chemistry of the Academy of Sciences of Moldova,
⁶ Grenoble High Magnetic Field Laboratory, CNRS, MPG

Disponibil în IBN: 28 iunie 2018

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We present the synthesis, structure, magnetic properties, as well as the Mössbauer and electron paramagnetic resonance studies of a ring-shaped [Fe^III₄Ln^III₂(Htea)₄(μ-N₃)₄(N₃)₃(piv)₃] (Ln = Y 1, Gd 2, Tb 3, Dy 4, Ho 5, Er, 6) coordination cluster. The Dy, Tb, and Ho analogues show blocking of the magnetization at low temperatures without applied fields. The anisotropy of the 3d ion and the exchange interaction between 3d and 4f ions in Fe₄Ln₂ complexes are unambiguously determined by high-field/high-frequency electron paramagnetic resonance measurements at low temperature. Ferromagnetic exchange interaction J_Fe-Ln is found which decreases upon variation of the Ln ions to larger atomic numbers. This dependence is similar to the behavior shown in the effective barrier values of complexes 3-5. Further information about the anisotropy of the Ln³⁺ ions was gathered with⁵⁷Fe Mössbauer spectroscopy, and the combination of these methods provides detailed information regarding the electronic structure of these complexes.