新型铕-钴异核配合物Eu_2Co_2[C_5H_3(COO)_2N]_6(H_2O)_4的合成、结构及性质研究  

Synthesis,Structure and Properties of a Novel Eu-Co Heteronuclear Complex Eu_2Co_2[C_5H_3(COO)_2N]_6(H_2O)_4

作　　者：唐小勇 王淑波 矫庆泽 詹世景 乐善堂[2] Tang Xiaoyong;Wang Shubo;Jiao Qingze;Zhan Shijing;Yue Shantang(Zhuhai Campus of Beijing Institute of Technology,Zhuhai 519088,China;School of Chemistry and Environment,South China Normal University,Guangzhou 510006,China)

机构地区：[1]北京理工大学珠海学院材料与环境学院,广东珠海519088 [2]华南师范大学化学与环境学院,广东广州510006

出　　处：《中国稀土学报》2018年第6期700-707,共8页Journal of the Chinese Society of Rare Earths

基　　金：北京理工大学珠海学院科研发展基金项目(XK-2016-15)资助

摘　　要：采用水热合成法,以吡啶二甲酸为基本构筑单元合成了铕-钴异核配合物Eu_2Co_2 [C_5H_3(COO)_2N]_6(H_2O)_4,并通过X射线单晶衍射仪、元素分析、差热热重(TG-DCS)、红外(IR)、荧光光谱、磁性分析等研究了其结构、荧光性质及磁性质等。研究发现配合物通过吡啶二甲酸桥接形成了独特的新型铕-钴双异核三维结构,同时具有磁学和荧光等颇具应用价值的性质。配合物的摩尔磁化率与温度的乘积随温度的降低从室温下的3.52cm^3·K·mol^(-1)逐渐下降到5 K下的0.27 cm^3·K·mol^(-1),表明相邻顺磁离子间存在反铁磁相互作用,·荧光光谱显示在395 nm激发光下Eu^(3+)的5D_0→~7F_1磁偶极子跃迁和~5D_0→~7F_2的电偶极子跃迁产生593和618nm的发射峰。619nm处的强度远远高于593nm处强度,表明了Eu^(3+)在晶体中的较低对称性。This work adopts the hydrothermal synthesis method,using pyridine two formic acid as the basic building blocks to synthesize Eu-Co heteronuclear complexes Eu2Co2[C5H3(COO)2N]6(H2O)4.The structure,fluorescent properties and magnetic properties were studied by X-ray diffraction,elemental analysis,thermogravimetric (TG-DCS),infrared spectroscopy (IR),fluorescence spectroscopy,magnetic analysis.It was found that the complexes formed a unique new structure of europium cobalt double heteronuclear by bridging pyridine dicarboxylic acid,and possessed the properties of magnetism and fluorescence.The product of molar susceptibility and the temperature decreases with the decrease of temperature from 3.52cm^3·K·mol^-1 at room temperature to 0.27cm^3·K·mol^-1 at 5K,indicating that the neighboring paramagnetic are antiferromagnetic interactions among magnetic ions,fluorescence spectra indicate that the emitted 395nm light excited Eu ^5D0→^7F1 magnetic dipole transition and ^5D0→^7F2 electric dipole transitions at 593 and 618nm.The strength of 619nm is much higher than that of 593nm,indicating the lower symmetry of Eu^3+ in the crystal.

关 键 词：异核配合物 稀土发光 磁学性能 吡啶二甲酸 

分 类 号：O614.33[理学—无机化学] O614.81[理学—化学]