基于多羧酸烟酸配体的镝、钬、铒和铥配合物的合成及荧光、磁学性质的表征

以5-(4-羧基苯氧基)烟酸配体(H₂cpna)和稀土金属离子Dy³⁺、Ho³⁺、Er³⁺和Tm³⁺为原料,采用水热法合成了4种稀土金属配合物M(Hcpna)(cpna)(H₂O)₃]_n,其中M=Dy(1)、Ho (2)、Er (3)、Tm (4)。单晶X射线衍射分析表明配合物1、2、3和4为同构配合物,均为一维链状结构。通过红外、元素分析以及粉末X射线衍射对所得配合物进行了表征,同时对配合物的荧光和磁学性质开展了研究。荧光测试结果表明,配合物1～4的荧光强度均低于配体H2cpna的荧光强度。在2～300 K温度范围内1 kOe直流电场下测试了配合物1～4的磁性,结果表明配合物1、2、3和4的χ_mT值分别为14.04、14.15、11.08和6.83 cm³·mol^-1·K,与文献理论值相符合。

Synthesis, fluorescence, and magnetic characterization of nicotinic acid ligand-based dysprosium, holmium, erbium, and thulium complexes

Four isomorphic rare earth complexesM(Hcpna)(cpna)(H₂O)₃]_n, where M=Dy (1), Ho (2), Er (3), Tm (4), have been synthesized by a solvothermal method based on 5-(4-carboxyphenoxy)nicotinic acid ligand (H₂cpna) and rare earth metal ions Dy³⁺, Ho³⁺, Er³⁺, and Tm³⁺. Single crystal X-ray diffraction analyses reveal that complexes 1, 2, 3, and 4 are isostructural, and the structures are all 1D chain structures. The complexes were characterized by IR, elemental analysis, and powder X-ray diffraction, while the fluorescence and magnetic properties of the complexes were studied. The fluorescence test results show that the fluorescence intensity of complexes 1-4 were all lower than that of the H₂cpna ligand. The magnetism of complexes 1-4 were studied in the 2-300 K range at 1 kOe dc field. The χ_mT values of complexes 1, 2, 3, and 4 were 14.04, 14.15, 11.08, and 6.83 cm³·mol^-1·K respectively at room temperature.