刚性配体2,2'-联吡啶诱导的2,2'-双咪唑金属配合物的合成与晶体结构

Synthesis and Crystal Structures of Metal Complexes with 2,2'-Biimidazole Induced by Rigid Ligand 2,2'-Bipyridine

合成了3种新的超分子配合物[Cd(H2biim)(2,2'-bipy)(NO3)2](1),[Cu(H2biim)(2,2'-bipy)(H2O)](NO3)2(2)和[Zn(H2biim)(2,2'-bipy)(H2O)](NO3)2(3)(H2biim=双咪唑;2,2'-bipy=2,2'-联吡啶),并通过X射线单晶衍射测定了其结构.配合物1～3均为单斜晶系,属于P2(1)/c空间群,在1中,Cd(II)为六配位,它与双咪唑的2个氮原子,联吡啶的2个氮原子和2个硝酸根的2个氧原子配位.在2和3中,Cu(II)和Zn(II)均为五配位的,它们与双咪唑的2个氮原子、2,2'-联吡啶的两个氮原子和一个水分子配位.1～3的对称单元均通过双咪唑、硝酸根和水之间形成的氢键R21(7),R21(4)和R44(18)构筑了1D链状超分子.

Three new complexes [Cd（H2biim）（2,2＇-bipy）（NO3）2] （1）, [Cu（H2biim）（2,2＇-bipy）（H2O）]（NO3）2 （2） and [Zn（H2biim）（2,2＇-bipy）（H2O）]（NO3）2 （3） （H2biim=2,2＇-biimidazole; 2,2＇-bipy=2,2＇-bipyridine） have been synthesized and characterized by X-ray single crystal diffraction. In 1, the Cd（II） atom is coordinated by two nitrogen atoms from one H2biim ligand, two nitrogen atoms from one 2,2＇-bipy ligand and two oxygen atoms from two nitrate anions. In 2 and 3, Cu（II） and Zn（II） atoms are coordinated by two nitrogen atoms from one H2biim ligand, two nitrogen atoms from one 2,2＇-bipy ligand and one oxygen atom from one H2O ligand. By multiple robust hydrogen bonds R21（7）, R21（4） and R44（18） formed by NH groups of 2,2＇-biimidazole, oxygen atoms of nitrate anions and water molecules, complexes 1 ～ 3 extend one-dimensional zigzag chains.