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A new binuclear nickel(Ⅱ) complex Ni2(HPT)4(H2O)3 (1) has been hydrothermally synthesized with nickel hydroxide,3,4-pyridine dicarboxylic acid and 3-(pyridin-2-yl)-1,2,4-triazole (HPT) in the mixed solution (the volume ratio of methanol and water is 1∶4).It crystallizes in tetragonal space group P42/n,with a =20.844(1),b =20.844(1),c =7.2463(7) (A),V=3148.2(5) (A)3,Dc =1.587 g/cm3,Z =4,μ(MoKa) =1.257,F(000) =1544,the final GOOF =1.043,R=0.0437 and wR =0.1297.The crystal structure shows that the whole molecule consists of two nickel ions which are bridged by four μ2-η1∶η0-3-(pyridin-2-yl)-1,2,4-triazole anions.The coordination environment of Ni(Ⅱ) ion is NiN6,giving a distorted octahedral geometry.The thermal stability and fluorescent and magnetic properties of the complex were investigated.