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Three new metal-organic complexes,namely [Zn(POA)2(H2O)2] (1),[Zn(POA)2(H2O)2]·2H2O (2) and [Zn(POA)2]n (3),have been synthesized by organic ligand 2-carboxylic acid-4-nitropyridine-l-oxide (POA) and zinc(Ⅱ) ions.The structures of complexes 1～3 are characterized by single-crystal X-ray analysis,XRD powder diffraction analysis,infrared spectroscopy and thermal stability analysis method.Complex 1 belongs to monoclinic system,space group C2/c with a =22.8215(15),b =7.5613(16),c =10.048(3) (A),β =109.47°,V =1634.7(6) (A)3,Z =4,F(000) =944,Dc =1.900 g/cm3,Ct2H10N4O12Zn,Mr =467.61 andt =1.584 mm-1.The whole molecule presents V shape.Complex 2 is a centrosymmetric structure in triclinic system with space group Pi:a =7.4728(5),b =7.6825(6),c =8.5184(6) (A),a =65.975(2),β =79.87(2),γ =89.855(2)°,V =4384.1(5) (A)3,Z =1,F(000) =256,Dc =1.908 g/cm3,C12H14N4O14Zn,Mr =503.64 andμ =1.492 mm1.Complex 3 is a one-dimensional chain structure belonging to monoclinic system and space group P21/c with a =4.9456(6),b =12.5322(14),c =11.2514(13) (A),β =97.313(11)°,V =6916.8(14) (A)3,Z =2,F(000) =432,Dc =2.072 g/cm3,C12H6N4O1oZn,Mr =431.58,and μ =1.852 mm-1.In three complexes,six oxygen atoms from the surrounding coordination atoms form a ZnO6 distorted octahedral coordination geometry around the zinc ions.Meanwhile,fluorescent properties of the three complexes were investigated at room temperature.The fluorescence spectroscopic analysis demonstrated that the ligand POA shows red-shift after coordinating with the zinc(Ⅱ) ions.