1. Efficient enhancement of magnetic anisotropy by optimizing the ligand-field in a typically tetranuclear dysprosium cluster.
- Author
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Liu, Jiang, Chen, Yan-Cong, Jiang, Zhong-Xia, Liu, Jun-Liang, Jia, Jian-Hua, Wang, Long-Fei, Li, Quan-Wen, and Tong, Ming-Liang
- Subjects
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MOLECULAR structure of ligands , *SINGLE molecule magnets , *MAGNETIC anisotropy , *MAGNETIC susceptibility , *CHELATING agents , *METAL clusters , *DYSPROSIUM compounds - Abstract
The perturbation to the ligand field around the lanthanide ion may significantly contribute to the magnetic dynamics of single molecule magnets. This can be demonstrated by two typical Dy4 cluster-based single molecular magnets (SMMs), [Dy4X2(μ3-OH)2(μ-OH)2(2,2-bpt)4(H2O)4]X2·2H2O·4EtOH (X = Cl and Br for 1 and 2, respectively), which were constructed by using 3,5-bis(pyridin-2-yl)-1,2,4-triazole (2,2-bptH) as the polynuclear-chelating ligand. Alternating-current (ac) magnetic susceptibility measurements show that the energy barriers in complexes 1 and 2 were immensely enhanced by comparing with our previous work due to the optimization of the ligand field around DyIII ions. Remarkably, their high thermal active barriers at 190 K (1) and 197 K (2) under a zero applied external dc magnetic field are also among the highest within the reported tetranuclear lanthanide-based SMMs. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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