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

摘要/Abstract

摘要： 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_r=726.25。两个配合物的配位单元组成和结构相似,中心离子都处于稍变形的三帽三棱柱的配位环境中。通过红外光谱、紫外光谱、热重分析仪和荧光光谱仪对两个配合物的性质进行表征。荧光分析表明,配体和配合物均有较强的荧光性能。

关键词: 稀土配合物, 镧系配合物, 镨系配合物, 4-硝基氮氧化吡啶-2-甲酸, 晶体结构, 荧光性质

Abstract: 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.

Key words: rare earth complex, lanthanide complex, praseodymium complex, 2-carboxylic acid-4-nitropyridine-1-oxide, crystal structure, fluorescence property

中图分类号:

O641.4

黄妙龄, 陈亮莹, 赵俞秉, 谭欣宇, 叶梦月. 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[J]. 人工晶体学报, 2023, 52(1): 125-131.

HUANG Miaoling, CHEN Liangying, ZHAO Yubing, TAN Xinyu, YE Mengyue. Synthesis, Crystal Structure and Fluorescence Properties of Lanthanum and Praseodymium Complexes Constructed by 2-Carboxylic Acid-4-Nitropyridine-1-Oxide[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2023, 52(1): 125-131.

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