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摘要
A series of Hdmh mononuclear dysprosium complexes, namely [Dy(dmh)(3)(MeOH)] (1), [Dy(dmh)(3)(2,2'-bpy)](2) (2), and [Dy(dmh)(3)(phen)] (3), and analogue complexes of complex 2 [Lu(dmh)(3)(2,2'-bpy)](2) (4) (Hdmh = 2,6-dimethyl-3,5-heptanedione, 2,2'-bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline), have been isolated by reaction of Hdmh and LnCl(3)6H(2)O with 2,2'-bpy/phen auxiliary ligands. X-ray crystallographic analysis reveals that all complexes 14 are mononuclear complexes. Complex 1 is seven-coordinated by three dmh ligands and one methanol. Complexes 2, 3 and 4 are all eight-coordinated by three dmh ligands and one 2,2'-bpy or phen. Magnetic studies indicate that complexes 2 and 3 exhibit slow relaxation at zero field but complex 1 does not. Strikingly, complex 2 exhibits mainly single slow relaxation under zero dc field and double slow relaxation under optimized dc field. In contrast, complex 3 exhibits double slow relaxation under zero dc field and single slow relaxation under optimized dc field. The origins of the double slow relaxation modes of complex 2 have been verified by dilution sample of complex 4.
- 出版日期2017
- 单位黑龙江大学
