摘要
Two dysprosium(Ⅲ) complexes derived from 2,2'-bipyridine-6,6'-dicarboxylic acid(H_2bpdc),[Dy(bpdc)(Hbpdc)]-3H_2O(1) and[Dy_2(bpdc)_3(H_2O)_3]·2.125H_2O(2),were isolated from the same hydrothermal reaction container as different phases.Compound1 is a mononuclear complex with a DyN_4O_4 coordination polyhedron;whereas compound 2 is a dinuclear complex with two types of eight coordinated dy sprosium(Ⅲ) ions,showing DyN_4O_4 and DyN_2O_6 coordination polyhedra,respectively.Remarkably,a new type of(H_2O)_6 supramolecular aggregate exists in the crystal structure of 2.Magnetic investigations revealed that 1 is a field-induced single-ion magnet with an effective energy barrier of 45.6 K,exhibiting two-step magnetic relaxation;while an intramolecular ferromagnetic interaction exists in 2,which is a field-induced single-molecule magnet,displaying two-step magnetic relaxation too,with effective energy barriers of 53.4 and 92.1 K,respectively.
Two dysprosium（Ⅲ） complexes derived from 2,2＇-bipyridine-6,6＇-dicarboxylic acid（H2bpdc）,[Dy（bpdc）（Hbpdc）]-3H2O（1） and[Dy2（bpdc）3（H2O）3]·2.125H2O（2）,were isolated from the same hydrothermal reaction container as different phases.Compound1 is a mononuclear complex with a DyN4O4 coordination polyhedron;whereas compound 2 is a dinuclear complex with two types of eight coordinated dy sprosium（Ⅲ） ions,showing DyN4O4 and DyN2O6 coordination polyhedra,respectively.Remarkably,a new type of（H2O）6 supramolecular aggregate exists in the crystal structure of 2.Magnetic investigations revealed that 1 is a field-induced single-ion magnet with an effective energy barrier of 45.6 K,exhibiting two-step magnetic relaxation;while an intramolecular ferromagnetic interaction exists in 2,which is a field-induced single-molecule magnet,displaying two-step magnetic relaxation too,with effective energy barriers of 53.4 and 92.1 K,respectively.
基金
supported by the National Key Basic Research Program of China(2013CB933403)
the National Natural Science Foundation of China(21471154,91022014)
the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB12010103)
