Magnetic Anisotropy of a Cyclic Octanuclear Fe(III) Cluster and Magneto-Structural Correlations in Molecular Ferric Wheels

作者：O. Waldmann, Robert J. Koch, S. Schromm, J. Schülein, Paul Müller, Ingo Bernt, Rolf W. Saalfrank, Frank Hampel, E. Balthes · 发表于：Inorganic Chemistry · 年份：2001 · DOI：10.1021/ic0012827 · 被引用次数：126 · 研究领域：Magnetism in coordination complexes、Lanthanide and Transition Metal Complexes、Polyoxometalates: Synthesis and Applications

The magnetic anisotropy of the cyclic octanuclear Fe(III) cluster [Cs subsetFe(8)[N(CH(2)CH(2)O)(3)](8)]Cl was investigated. Based on a spin Hamiltonian formalism and the consequent use of all symmetries, the magnetic anisotropy could be calculated exactly to first order, i.e., in the strong exchange limit. Experimentally, the magnetic anisotropy was investigated by magnetic susceptibility and high-field torque magnetometry of single crystals. The field and angle dependence of the torque at 1.7 K could be accurately reproduced by the calculations with one single parameter set, providing accurate results for the coupling constant and single-ion zero-field-splitting. These magnetic parameters are compared to those of several related hexanuclear ferric wheels and are discussed with respect to magneto-structural correlations for both coupling constant and single-ion anisotropy.