叠氮基桥联CuⅡ/MnⅡ配合物的合成、结构和磁性研究OA

Two Schiff base ligands were prepared by the condensation reactions of 5-bromo-3-methox-ysalicylaldehyde with 1,3-propanediamine or 3-methoxysalicylaldehyde with ethylenediamine.These lig-ands were subsequently used to react with copper acetate monohydrate and manganese chloride tetra-hydrate,using sodium azide as an auxiliary ligand under the slow volatilization conditions.This process resulted in the formation of two new azido-bridged magnetic complexes:[Cu2(BrLxtn)2(μ1,1-N3)2](1)(BrLxtn=(E)-2-(((3-aminopropyl)imino)methyl)-4-bromo-6-methoxyphenol)and[Mn2 Cu2(MeOen)2(μ1,1-N3)4](2)(MeOen=6,6'-((1E,1'E)-(ethane-1,2-diylbis(azaneylyli-dene))bis(methaneylylidene))bis(2-methoxyphenol)).The structures of the obtained complexes 1 and 2 were characterized by elemental analysis,Fourier transform infrared spectroscopy and X-ray single crys-tal diffraction.The result showed that the complex 1 features an azide bridged dimeric binuclear copper(II)structure.The coordination geometry of copper ions is a deformed five-coordinate tetrahedron formed by the tridentate N2O Schiff base and two azide ligands.In complex 2,the copper ion is coordinated by N2O2 unit from the Schiff base ligand to form a planar square geometry,while the manganese ion is coor-dinated with the N3O2 unit to form a distorted triangular bipyramidal geometry.The two Cu-Mn-Schiff base units were bridged by azide groups,forming a Mn2Cu2 tetranuclear structure.Investigation into the temperature-dependent magnetic susceptibilities of the complexes 1 and 2 indicated antiferromagnetic and ferromagnetic coupling interactions between the azide-bridged Cu or Mn ions,respectively.