Hydrothermal Synthesis,Crystal Structure and Properties of a New Binuclear Nickel(Ⅲ) Complex with 3-(Pyridin-2-yl)-1,2,4-triazole

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)A³,D_c=1.587 g/cm³,Z=4,μ(Mo Ka)=1.257,F(000)=1544,the final GOOF=1.043,R=0.0437 and w R=0.1297.The crystal structure shows that the whole molecule consists of two nickel ions which are bridged by fourμ₂-η¹:η^0-3-(pyridin-2-yl)-1,2,4-triazole anions.The coordination environment of Ni(II) ion is Ni N₆,giving a distorted octahedral geometry.The thermal stability and fluorescent and magnetic properties of the complex were investigated.