叠氮桥联一维链状聚合物[Cu_2(N_3)_4(en)_2]_n的合成及结构和磁性的研究

由CuCl2、NaN3和乙二胺在水溶液中反应,合成了分子聚合物Cu2(N3)4(en)2]n(1)(en=乙二胺),并通过X射线单晶衍射确定了其晶体结构.晶体结构属于单斜晶系,C2/c空间群,其晶胞参数为a=17.672(5)A°,b=6.397(4)A°,c=26.221(7)A°,β=100.089(5)°,Z=16.在配合物1中,Cu(1)和Cu(2)离子分别采取四配位的平面几何构型和变形的八面体几何构型,每个Cu(1)之间通过单个叠氮以1,3位方式桥联形成一维链状结构.磁性研究表明,在配合物1中,Cu(II)与Cu(II)离子之间表现为反铁磁相互作用.用哈密顿函数H=-2JSCuSFe对其χMT-T曲线进行了拟合,得到配合物1的朗日因子g=2.11,交换常数J=-0.87cm-1.

Synthesis Structure and Magnetic Properties of Azide Bridge Chiral Dinuclear Complexes [Cu2(N3)4(en)2]n

The reaction of CuCl2、NaN3 and en in water afforded a new complex Cu2(N3)4(en)2]n(1)(en=ethylene diamine) was synthesized and determined by X-ray single crystal diffraction.It crystalizes in the monoclinic system,chiral space group C2/c with lattice parameters: a=17.672(5),b=6.397(4),c=26.221(7),β=100.089(5)°,Z=16.The Cu(II) ions are coordinated to a R-Me4chxn ligand as well as to the three nitrogen atoms of azide groups,forming a square-pyramidal coordination conformation.Magnetic studies for complexes 1 show antiferromagnetic coupling between the Cu(II) and Cu(II) ions. The best-fit for χMT vs T with an Hamiltonian H=-2JSFeSCu leads to the parameters g=2.11,J=-0.87 cm-1 for 1.