Cyclometalated Analogues of Platinum Terpyridine Complexes: Kinetic Study of the Strong σ-Donor Cis and Trans Effects of Carbon in the Presence of a π-Acceptor Ligand Backbone
作者:Andreas Hofmann、Lutz Dahlenburg、Rudi van Eldik
DOI:10.1021/ic034400+
日期:2003.10.1
dependence of the reactions. Two crystal structures of [Pt(N-N-C)Cl] were determined (yellow and red polymorphs); the intense red color of the latter polymorph results from Pt-Pt interactions (Pt-Pt distance = 3.366 A). The data enable an analysis of the cis and trans effects and the influence of the strong sigma-donor carbon in the presence of an electron withdrawing pi-acceptor ligand backbone. The results
配合物[Pt(NNC)Cl](NN-CH = 6-苯基-2,2'-联吡啶),[Pt(NCN)Cl](N-CH-N = 1,3-di( (2-吡啶基)苯)和[Pt(NNN)Cl] Cl(NNN = 2,2':6',2''-叔吡啶),并带有亲核试剂Br(-),I(-),对于在甲醇作为溶剂中,已经研究了前两个配合物,也就是硫脲,N,N-二甲基硫脲和N,N,N',N'-四甲基硫脲。在硫脲的情况下,还根据反应的温度和压力依赖性来确定活化参数DeltaH,DeltaS和DeltaV。确定了[Pt(NNC)Cl]的两个晶体结构(黄色和红色多晶型物);后者多晶型物的深红色由Pt-Pt相互作用产生(Pt-Pt距离= 3.366 A)。该数据能够分析在存在吸电子pi受体配体骨架的情况下强σ供体碳的顺式和反式效应以及影响。结果表明,反式碳供体的通气作用大大提高了内在反应性,但由于金属中心上亲电性的降低,亲核性明