A new -diketonate Dy(III) singleion magnet featuring multiple magnetic relaxation processes

作者：Cen, Peipei; Ma, Xiufang; Liu, Xiangyu^*; Zhang, Yi-Quan; Xie, Gang; Chen, Sanping^*

来源：Journal of Coordination Chemistry, 2018, 71(14): 2209-2224.

DOI：10.1080/00958972.2018.1480762

• Dy(III)
• -diketonate
• singleion magnet
• singlemolecule magnet

A -diketonate mononuclear dysprosium compound, [Dy(TFNB)(3)(bpy)] (1) (TFNB=4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione, bpy=2,2-bipyridine), has been prepared and structurally and magnetically characterized. X-ray crystallographic analysis reveals that 1 contains two crystallographically equivalent Dy(III) ions of which the eight-coordinate geometries uniformly behave as distorted square antiprismatic configurations (D-4d). Magnetic investigations demonstrate that 1 displays dual relaxation processes of SMMs behavior with the effective barrier (E/k(B)) of 23.44K under 1200 Oe DC field, corresponding to the coexistence of two metal centers in the structure of the compound. The comparative studies of some Dy(III)-based SIMs with TFNB ligand have been conducted as well. Ab initio studies demonstrate that the Kramers doublet ground state is predominantly axial with the g(z) tensors of two Dy(III) fragments matching the Ising-limit factor (20) anticipated for the pure M-J=+/- 15/2 state.
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• 出版日期2018
• 单位宁夏大学; 西北大学; 南京师范大学