摘要
为了进一步研究含苯并咪唑有机配体与Zn(Ⅱ)的配位反应规律和性质,利用双齿配体2-氨甲基-1H-苯并咪唑(AMBI)和ZnSO_4·7H_2O在甲醇-水体系中进行反应,得到了一维链状结构配位聚合物{[Zn(AMBI)(H_2O)SO_4]·0.5H_2O}n,测定了晶体结构,采用元素分析、红外光谱、紫外光谱法对配合物进行了表征,并对其热稳定性进行了研究。X射线衍射单晶结构表明:配合物属于单斜晶系,C2/c空间群,Zn(Ⅱ)与来自AMBI的2个氮原子、硫酸根的2个氧原子和水分子的1个氧原子配位,形成一个空间扭曲的四方锥结构;配位聚合物通过硫酸根形成一维链状结构,并进一步通过氢键和π…π堆积形成了三维超分子结构。通过对配合物超分子体系的结构研究,进一步认识了氢键和π…π堆积等非共价作用和配体结构对超分子拓扑结构的影响,对于合理选择有机配体、合成结构新颖的配位聚合物具有重要的参考价值。
In order to further study the coordination reaction rules and properties of organic ligands containing benzimidazole with Zn(Ⅱ),a new one-dimensional coordination polymer{[Zn(AMBI)(H2O)SO4]·0.5H2O}n has been synthesized by the reaction of zinc(Ⅱ)sulfate heptahydrate with the bidentate ligand 2-aminomethyl-1H-benzimidazole(AMBI)and characterized by elemental analysis,IR,UV spectrum,TG and single-crystal X-ray diffraction.The thermal stability is studied.X-ray single-crystal structure analysis shows that the colorless block crystal of the title complex belongs to monoclinic system,space group C2/c.In the complex,the Zn(Ⅱ)is coordinated by two N atoms from one AMBI ligand,two O atoms from SO2-4 ion and one O atom from water in a distorted square pyramidal coordination geometry.The structure of the title complex exhibits an infinite chain-like structure through bridging SO2-4 anion.The hydrogen-bonding andπ…πinteractions extend the complex into quasi 3D networks.Through the structure study on the supra-molecular complex,it′s further understood about how the structure of the ligand and non-covalent interactions,such as hydrogen bonding andπ…πstacking,influence the topological structures of supra-molecular compounds.This study has important reference value for rational selection of organic ligands and synthesis of coordination polymers with novel structures.
作者
杨晓东
赵海燕
YANG Xiaodong;ZHAO Haiyan(School of Science,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China)
出处
《河北科技大学学报》
CAS
2018年第5期416-421,共6页
Journal of Hebei University of Science and Technology
基金
国家自然科学基金(B060902)
