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