Nucleophilic reactivity in substitution reactions at planar tetra-coordinate monocationic platinum(II) complexes. Kinetics of displacement of chloride from chloro[2,6-bis(methylthiomethyl)pyridine]platinum(II) cation
作者:B. Pitteri、L. Canovese、G. Chessa、G. Marangoni、P. Uguagliati
DOI:10.1016/s0277-5387(00)83526-3
日期:1992.1
log k2° for the present mono-cationic substrate and log k2° for the substitution reactions of a smaller number of nucleophiles with other mono-cationic platinum(II) substrates previously studied. A new more extensive nucleophilicity scale, based on [Pt(SNS)Cl]+ as the standard substrate, that is appropriate to mono-cationic platinum(II) substrates, is proposed.
摘要[Pt(SNS)Cl] +阳离子[SNS = 2,6-双(甲硫甲基)吡啶]中氯化物被各种亲核试剂[H2O,OH-,Me2SO,NO2-,NH3,吡啶(py),C5H10NH(pip),N3-,Br-,(C2H5)2S,(CH2)4S,I-,N,N,N',N'-四甲基硫脲(tmtu),SCN-,Ph3As,SO32 -,硫脲(tu),SeCN-和CN-]在25°C的水中进行了研究,μ= 0.50 mol dm-3(LiClO4)。对数k2°值(k2°是μ= 0时的二阶速率常数)不遵循通常对nPt°标度的依赖性,而对于本单阳离子底物,对数k2°之间存在良好的线性关系对数亲核试剂与先前研究的其他单阳离子铂(II)底物的取代反应的对数和log k2°。基于[Pt(SNS)Cl] +作为标准底物的新的更广泛的亲核标度,