Di- and octa-nuclear dysprosium clusters derived from pyridyl-triazole based ligand: {Dy2} showing single molecule magnetic behaviour.

摘要: Two dysprosium aggregates, formulated as [Dy2(μ-OH)2(H2bpte)2Cl2(MeOH)2]Cl2 (1), and [Dy8(μ-OH)8(bpte)8]·24H2O (2) (H2bpte = 1,2-bis(3-(pyridin-2-yl)-1H-1,2,4-triazol-5-yl)ethane), were obtained using solvothermal reactions. Upon changing the metal salt synthetic reaction conditions, an eight-member {Dy8} ring was isolated. Complex 1 is centrosymmetric in which two {Dy2} clusters are connecting to each other through hydrogen bonding. 2 forms DyIII with inner diameter of 4.5 A first reported {Dy8(μ-OH)8} core lanthanide-hydroxo clusters. The H2bpte ligand displays trans,trans- cis,cis-coordination modes 2, respectively. Alternating current (ac) magnetic measurements both complexes carried out. In 1, out-of-phase susceptibilities (χ''M) below 9 K confirm slow relaxation magnetization, a typical characteristic single-molecule magnets (SMMs).