2,2′-二硝基-4,4′-联苯二甲酸构筑的四个稀土金属有机骨架
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摘要
在溶剂热条件下,2,2′-二硝基-4,4′-联苯二甲酸(H2L)与Ln(NO3)3·6H2O反应,成功合成了4个稀土金属有机骨架(LOFs):[Ln L1.5(DMA)]n(Ln=Eu(1),Gd(2),Tb(3),Dy(4),DMA=N,N-二甲基乙酰胺)。采用元素分析、红外(IR)、热重(TGA)、单晶和粉末X射线衍射(XRD)对其结构进行了表征。晶体结构分析表明:LOFs 1~4均为单斜晶系、C2/c空间群,为异质同晶的双节点(3,8)-连接的三维(3D)拓扑结构。LOFs 1~4均具有高的热稳定性(分解温度Td>322℃),1显示铕的特征荧光光谱,而3仅显示配体的荧光发射。
Four lanthanide-organic frameworks(LOFs), [Ln L1.5(DMA)]n(Ln=Eu(1), Gd(2), Tb(3), Dy(4); H2 L =2,2′-dinitro-4,4′-biphenyldicarboxylic acid, DMA =N,N-dimethylacetylamide), have been prepared by the solvothermal reaction of H2 L and Ln(NO3)3·6 H2 O. Their structures have been characterized by elemental analyses, IR,TGA, single-crystal and powder X-ray diffraction(XRD) studies. Crystal structure analyses show that LOFs 1~4 crystallize in the monoclinic system with C2/c space group. LOFs 1 ~4 are isomorphous and possess a binodal(3,8)-connected three-dimensional(3 D) topology network. All the LOFs exhibit high thermal stabilities(Td>322 ℃).Furthermore, 1 displays characteristic luminescence of Eu(Ⅲ) ion while 3 only shows the emission peak of the L2-ligand.
Four lanthanide-organic frameworks(LOFs), [Ln L1.5(DMA)]n(Ln=Eu(1), Gd(2), Tb(3), Dy(4); H2 L =2,2′-dinitro-4,4′-biphenyldicarboxylic acid, DMA =N,N-dimethylacetylamide), have been prepared by the solvothermal reaction of H2 L and Ln(NO3)3·6 H2 O. Their structures have been characterized by elemental analyses, IR,TGA, single-crystal and powder X-ray diffraction(XRD) studies. Crystal structure analyses show that LOFs 1~4 crystallize in the monoclinic system with C2/c space group. LOFs 1 ~4 are isomorphous and possess a binodal(3,8)-connected three-dimensional(3 D) topology network. All the LOFs exhibit high thermal stabilities(Td>322 ℃).Furthermore, 1 displays characteristic luminescence of Eu(Ⅲ) ion while 3 only shows the emission peak of the L2-ligand.
引文
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