平面正方形配合物取代反应的机理和反位效应(英文)  

Ligand substitution reaction mechanism and trans-effect of square-planar complexes

作　　者：于兆文[1] 张武[1] 滕洪梅[1] 

机构地区：[1]河南大学化学化工学院,河南开封475004

出　　处：《化学研究》2013年第4期331-335,共5页Chemical Research

摘　　要：平面正方形配合物反位效应的起因已经困惑了人们将近一个世纪。作者根据平面正方形配合物取代反应的缔合机理,考虑了配体取代反应进行过程中配体间的排斥作用,分析了最易形成的中间体和过渡态2的空间构型;揭示了反位效应的起因,提出了一种配体排斥理论,从而比较系统和圆满地解释了平面正方形配合物取代反应的反位效应。The cause of trans-effect for square planar complexes has puzzled people for nearly a century.Based on the fact that the ligand substitution reactions of square-planar complexes react by a SN2 mechanism,the most preferable configurations for the intermediate and transition state 2were deduced while the repulsions between the ligands in the reaction pathway were considered.Furthermore,the causes of trans-effect were revealed,and a new theory——ligand repulsion theory was proposed to illustrate the trans-effect.It was found that as-proposed theory can be well adopted to independently and systematically explain the trans-effect for all kinds of monodentate ligands.

关 键 词：平面正方形配合物 取代反应 反应机理 反位效应 

分 类 号：O641[理学—物理化学]