稀土配合物{La［o-C6H4(NO2)(CO2)］3·(DMF)2}2的晶体结构及其荧光性能

合成了一种新的双核倒反中心的稀土镧配合物{La［o-C6H4(NO2)(CO2)］3·(DMF)2}2. 通过元素分析、 核磁共振谱和红外光谱对配合物的组成和结构进行了表征,  用热重分析研究了该配合物的热稳定性,  用X射线单晶衍射法测定了其晶体结构. 镧配合物{La［o-C6H4(NO2)(CO2)］3·(DMF)2}2晶体属三斜晶系, 空间群P1,  晶胞参数a=1.902(2) nm, b=1.245 0(2) nm, c=1.298 7(2) nm, α=64.555(2)°, β=66.348(2)°, γ=71.920(2)°, V=1.569 5(5) nm3, Dc=1.658 Mg/m3, Z=2, μ=1.437 mm-1, F(000)=784. 配合物中有2个La(Ⅲ)被4个邻硝基苯甲酸的羧酸根的负氧离子桥联, 每个La(Ⅲ)的中心离子配位数为9,  配位原子分别来自于7个邻硝基苯甲酸的羧酸根的负氧离子和2个DMF的羰基氧原子. 化合物中的氢键和π…π堆积作用使其成为三维立体结构. 同时发现了标题化合物固体具有光致发光现象, 发光性能测试表明， 配合物具有很好的荧光性质.

Crystal Structures and Fluorescence Property of Rare Earth Complexes {La[o-C6H4(NO2)(CO2)]3·(DMF)2}2

The o-nitro-benzoic acid(C7H5O4N) and N,N-dimethylformamide(DMF) coordinate with La(Ⅲ) to form a dinuclear complex The o nitro benzoic acid(C7H5O4N) and N,N dimethylformamide(DMF) coordinate with La(Ⅲ) to form a dinuclear complex The o nitro benzoic acid(C7H5O4N) and N,N dimethylformamide(DMF) coordinate with La(Ⅲ) to form a dinuclear complex La［o C6H4(NO2)(CO2)］3·(DMF)2}2. The complex resides on an inversion center. The structure of the complex is characterized by IR, 1H NMR, 13C NMR, UV and fluorescent emission spectra. The results show that the complex crystallizes in a triclinic system, space group P1, cell parameter a=1.902(2) nm, b=1.245 0(2) nm, c=1.298 7(2) nm, α=64555(2)°, β=66348(2)°, γ=71.920(2)°, V=1.569 5(5) nm3,  Dc=1.658 Mg/m3, Z=2, μ=1.437 mm-1, F(000)=784. In the complex, two La(Ⅲ) are bridged by four o nitro benzoic acids liganding with their carboxyl. The coordination number of La(Ⅲ) is nine and the coordinated atoms are all oxygen from the carboxyl and carbonyl. Nine oxygen atoms(seven from a carboxyl of o nitro benzoic acid and two from DMF molecule) occupy the nine coordination sites around La(Ⅲ), respectively. Hydrogen bonds and aromatic π…π stacking interactions assemble the title complex into a three dimensional network. Luminescence measurement shows that the complex emits fluorescence. . The complex resides on an inversion center. The structure of the complex is characterized by IR, 1H NMR, 13C NMR, UV and fluorescent emission spectra. The results show that the complex crystallizes in a triclinic system, space group P1, cell parameter a=1.902(2) nm, b=1.245 0(2) nm, c=1.298 7(2) nm, α=64.555(2)°, β=66.348(2)°, γ=71.920(2)°, V=1.569 5(5) nm3,  Dc=1.658 Mg/m3, Z=2, μ=1.437 mm-1, F(000)=784. In the complex, two La(Ⅲ) are bridged by four o-nitro-benzoic acids liganding with their carboxyl. The coordination number of La(Ⅲ) is nine and the coordinated atoms are all oxygen from the carboxyl and carbonyl. Nine oxygen atoms(seven from a carboxyl of o-nitro-benzoic acid and two from DMF molecule) occupy the nine coordination sites around La(Ⅲ), respectively. Hydrogen bonds and aromatic π…π stacking interactions assemble the title complex into a three dimensional network. Luminescence measurement shows that the complex emits fluorescence. The complex resides on an inversion center. The structure of the complex is characterized by IR, 1H NMR, 13C NMR, UV and fluorescent emission spectra. The results show that the complex crystallizes in a triclinic system, space group P1, cell parameter a=1.902(2) nm, b=1.245 0(2) nm, c=1.298 7(2) nm, α=64.555(2)°, β=66.348(2)°, γ=71.920(2)°, V=1.569 5(5) nm3,  Dc=1.658 Mg/m3, Z=2, μ=1.437 mm-1, F(000)=784. In the complex, two La(Ⅲ) are bridged by four o-nitro-benzoic acids liganding with their carboxyl. The coordination number of La(Ⅲ) is nine and the coordinated atoms are all oxygen from the carboxyl and carbonyl. Nine oxygen atoms(seven from a carboxyl of o-nitro-benzoic acid and two from DMF molecule) occupy the nine coordination sites around La(Ⅲ), respectively. Hydrogen bonds and aromatic π…π stacking interactions assemble the title complex into a three dimensional network. Luminescence measurement shows that the complex emits fluorescence.