蝴蝶形单分子配合物的合成、晶体结构及其对水溶液中有害离子的检测

用苯并咪唑基配体5,5′-二(2-苯并咪唑基)-2,2′-联吡啶(H2L)与镍、锌离子溶剂热合成了配合物Ni(HL)(HCOO)(H2O)](1)和Zn(H2L)(H2O)2](NO3)2(2)。X射线单晶测试表明镍与锌配合物的晶体结构是只含一个配体和一个金属离子的蝴蝶形单分子。配合物分子之间存在大量分子间氢键,配合物1通过分子间氢键连接成了二维层状结构,配合物2通过分子间氢键连接成了三维超分子结构。配合物1和2在水溶液中很稳定,且能够微溶于水。荧光测试表明配合物2的固体及在水溶液中都具有很强的荧光性质,且能够在水溶液中高选择性、高灵敏度检测有害重金属离子Hg^2+及氧化性阴离子Cr2O7^2-。

Butterfly-Shaped Monomers: Syntheses, Structures and Sensing of Harmful Ions in Aqueous Solution

Solvothermal syntheses of benzimidazyl ligand(H₂L) with zinc and nickel ions resulted in two monomeric complexes,Ni(HL)(HCOO)(H₂O)] (1) andZn(H₂L)(H₂O)₂](NO₃)₂ (2). The two monomeric complexes are butterfly-shaped, which are further connected into 2D or 3D networks through intermolecular hydrogen bonds. The two monomers are stable in aqueous solution and slight soluble in water. Fluorescence measurements showed that complex 2 had strong fluorescence properties in both solid state and aqueous solutions. A further study shows that both metal ion Hg²⁺ and anion Cr₂O₇^2- have high fluorescence quenching effect on in aqueous solution of 2, indicating that 2 could be used as a highly selective and sensitive detection probe for Hg²⁺ and Cr₂O₇^2-.