4-硝基氮氧化吡啶-2-甲酸构筑的镧、镨配合物的合成、晶体结构及荧光性质

选择刚性有机化合物4-硝基氮氧化吡啶-2-甲酸(POA)作为配体，与稀土金属La(III)、Pr(III)反应，合成了2个一维配位聚合物。X射线单晶衍射结果表明：配合物1的分子式为{La(POA)₃H₂O]·CH₃OH}_n,属于单斜晶系，空间群是P2₁/c。该晶胞参数分别为a=1.756 8 nm,b=0.663 6 nm,c=2.048 6 nm,α=90°,β=96.96°,γ=90°,V=2.370 7 nm³,M_r=738.28。配合物2的分子式为{Pr(POA)₃H₂O]·H₂O}_n,属于单斜晶系，空间群是P2₁/c。该晶胞参数分别为a=1.757 8 nm,b=0.656 9 nm,c=2.046 7 nm,α=90°,β=97.20°,γ=90°,V=2.344 8 nm³,M_...

Synthesis,Crystal Structure and Fluorescence Properties of Lanthanum and Praseodymium Complexes Constructed by 2-Carboxylic Acid-4-Nitropyridine-1-Oxide

Two one-dimensional coordination polymers were synthesized using rigid organic compound 2-carboxylic acid-4-nitropyridine-1-oxide(POA) as ligand, reacting with rare earth La(III) and Pr(III). The single crystal X-ray diffraction results show that the molecular formula of complex 1 is {La(POA)₃H₂O]·CH₃OH}_n, which belongs to monoclinic system, and the space group is P2₁/c; with a=1.756 8 nm, b=0.663 6 nm, c=2.048 6 nm, α=90°, β=96.96°, γ=90°, V=2.370 7 nm³, M_r=738.28. The molecular formula of complex 2 is {Pr(POA)₃H₂O]·H₂O}_n, which belongs to monoclinic system, and the space group is P2₁/c. The cell parameters are a=1.757 8 nm, b=0.656 9 nm, c=2.046 7 nm, α=90°, β=97.20°, γ=90°, V=2.344 8 nm³, M_r=726.25. The composition and structure of coordination units of two complexes are similar, and the central Ln(III) ion is in the coordination environment of a slightly modified tricapped trigonal prism configuration. The properties of two complexes were characterized by infrared, ultraviolet, thermogravimetric analyzer and fluorescence spectrometer. Fluorescence analysis shows that both ligand and complexes have strong fluorescence properties.