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机构地区:[1]延安大学化学与化工学院,陕西延安716000
出 处:《延安大学学报(自然科学版)》2013年第4期37-40,共4页Journal of Yan'an University:Natural Science Edition
基 金:国家自然科学基金(21003103);陕西省教育厅科技项目(12JK0609)资助
摘 要:利用水热法制备了一种新型稀土配合物[Eu(NAA)3(2,2'-bipy)](NAA=萘乙酸;2,2'-bipy=2,2'-联吡啶),通过X-衍射单晶结构分析、元素分析、红外光谱分析以及荧光光谱分析进行了表征.结构分析表明,标题配合物属于三斜晶系,Pī空间群,晶胞参数a=1.21506(15)nm,b=1.28762(16)nm,c=1.3144(3)nm,α=96.792(3)°,β=94.331(3)°,γ=115.843(2)°,V=1.8191(5)nm3,Z=2。金属离子Eu1(Ⅲ)与三个NAA配体和一个2,2'-bipy配体配位,处于九配位的单帽四方反棱柱构型中。配合物中存在点对面式和面对面式的两种π-π堆积作用共同构筑了三维超分子结构。荧光分析表明,配合物发光主要表现为金属离子Eu(Ⅲ)的特征发光峰。A new rare - earth coordination polymer [ Eu (NAA) 3 (2,2′- bipy) ] ( 1 ) ( NAA = naphthalene acetic acid, 2,2′- bipy = 2,2′- bipyridine) was synthesized under hydrothermal condition, and characterized by single crystal X - ray diffraction technique, elemental analysis, IR and fluorescence spectrum. Structural analysis shows that complex 1 crystallizes in the triclinic crystal system, Pispace group with crystal cell parameters:a = 1. 21506(15) nm,b= 1.28762(16) nm,c= 1.3144(3) nm,α= 96.792(3)°,β= 94.331(3)°,γ=115.843(2)°,V = 1. 8191 (5) nm3, Z = 2. Each Eu(Ⅲ) ion is coordinated with three NAA ligands and one 2,2- bipy molecules, and lies in a nine - coordinated one - capped anti - square prism geometry. There are two kinds of π - π packing interactions of point - to - face fashion and face - to - face fashion self - assembly into 3 D supramolecular structure. The fluorescence spectrum indicates that the emissions of complex 1 can be contributed to the characteristic emissions of Eu (Ⅲ) ion.
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