2鄄吡啶甲醛缩对氨基苯甲酸席夫碱Co（II）、Cd（II）配合物的合成及晶体结构

摘要

为了探究席夫碱及其配合物的空间结构,利用常温静置法合成了2-吡啶甲醛缩对氨基苯甲酸席夫碱的配合物1([CoL2(H2O)2]·5H2O)和配合物2({[Cd(L)(HL)(H2O)]·ClO4·H2O}n(HL=2-吡啶甲醛缩对氨基苯甲酸；L=2-吡啶甲醛缩对氨基苯甲酸根)),并用X射线单晶衍射方法测得了二者的晶体结构.结果显示：配合物1为单斜晶系,空间群为P21/c；配合物2为正交晶系,空间群是Pbca.结构分析表明：配合物1中的Co2+离子采用六配位模式,分别与2个配体分子中的4个N原子和2个水分子中的2个O原子配位形成单核分子；配合物2为一维链状结构,每个Cd2+离子采用七配位模式,分别与HL中的2个N原子,L中的2个N原子、2个O原子以及水中的O原子进行配位.%In order to explore the spatial structures of Schiff bases and their complexes, two new complexes, [CoL2 (H2 O)2]·5H2 O and {[Cd(L) (HL) (H2 O)]·ClO4·H2 O}n (HL =4-N-(2’-pyridylimine)benzoic acid; L =4-N-(2’-pyridylimine) benzoic acid radical), had been synthesized by stewing method and structurally determined by X-ray diffraction analysis. The result shows that the first complex crystallizes in monoclinic system with space group P21/c and the second complex crystallizes in orthorhombic system with space group Pbca. The structure analysis shows that the first complex is a mononuclear molecule and the metal center adopts a six-coordination geometry formed by four N atoms from two ligands and two O atoms from two H2 O molecules;the second complex is one-dimensional chain structure and each metal center adopts a seven-coordination geometry formed by four N atoms and two O atoms from L and HL, and one O atom from H2 O.