基于席夫碱配体的Gd(Ⅲ)/Dy(Ⅲ)配合物的结构和磁性

摘要

以席夫碱2-羟基-3-甲氧基-5-溴苯甲醛肟(HL)为配体,合成了2例未见文献报道的席夫碱-稀土双核配合物[Gd2(L)4(HCOO)2(CH3OH)2](1)和[Dy2(L)4(CH3COO)2(CH3OH)2](2).X射线单晶衍射分析表明配合物1和2中镧系金属均为对称的九配位双核结构对配合物的磁性测试结果表明配合物1中双核Gd(Ⅲ)离子之问存在着弱的反铁磁相互作用,交流磁化率测试结果表明,配合物2显示出频率依赖.%Two novel dinuclear Ln(Ⅲ) complexes [Gd2(L)4(HCOO)2(CH3OH)2] (1) and [Dy2(L)4(CH3COO)2(CH3OH)2](2) (HL=2-hydroxy-3-methoxy-5-bromobenzaldehyde oxime) have been successfully synthesized and characterized by single crystal X-ray diffraction,IR spectroscopy and elemental analyses.Single crystal X-ray crystallographic analyses reveal that these two complexes have similar structures,in which two symmetric nine-coordinate Ln(Ⅲ)ions are bridged by two phenoxide groups from two Schiff base ligands,two formate ions for 1 and two acetate ions for 2 respectively.Magnetic studies reveal that weak antiferromagnetic interaction between Gd (Ⅲ) ions existing in complex 1,while complex 2 shows slow relaxation of magnetization.CCDC:1570377,1;1570378,2.