两个基于苯并咪唑还原席夫碱的双核铜(Ⅱ)配合物的合成、晶体结构和电化学性质

摘要

在甲醇体系中,分别将苯并咪唑还原席夫碱HL与四氟硼酸铜和硝酸铜进行配位反应得到2个结构类似的双核铜配合物[CuL(CH3OH)]2(BF4)2 (1)和[CuL(NO3)2]2 (2)(HL=2-(((2-(2-benzimidazyl) ethyl)aimino)methyl)phenol),并用元素分析、红外光谱、紫外-可见光谱和单晶X射线衍射对其结构进行了表征.结构分析表明:2个配合物均属于单斜晶系,P21/c空间群,为酚氧桥联的双核铜结构,其中每个Cu(Ⅱ)处于N2O3的畸变四方锥构型.配合物中的氢键将配合物1和配合物2分别连接成一维和三维网络结构.采用循环伏安法测定了双核配合物的氧化还原电位,表明2个配合物均显示2个准可逆单电子还原过程.%Two binuclear copper(Ⅱ) complexes of the reduced Schiff base,namely,HL=2-(((2-(2-benzimidazyl) ethyl) aimino)methyl)phenol (HL) have been synthesized and characterized by C,H and N microanalyses,spectroscopic (FT-IR,UV-Vis) as well as electrochemical techniques and single-crystal X-ray diffraction.The crystal structures of [CuL(CH3OH)]2(BF4)2 (1) and [CuL(NO3)2]2 (2) show that the Cu(Ⅱ) atoms are bridged by two phenolato oxygen atoms in the dimers.The geometries around Cu (Ⅱ) atoms are distorted square pyramid with the Addison parameters (τ) of 0.31 and 0.35 for 1 and 2,respectively.Furthermore,the complex units in 1 and 2 are linked into 1D and 3D supramolecular networks by H-bonding in the solid state,respectively.The electrochemical studies of 1 and 2 show two quasi-reversible one electron reduction processes.