Reactions of 1,2-diaminoethane-N,N,N′N′-tetra(N-methylacetamide), L, with potassium tetrachloroplatinate(II). Crystal and molecular structures of Pt(LH−2)Cl2·2H2O, a novel platinum(IV) complex containing deprotonated amide ligands, and of (2H+-L) [PtCl4]
作者:Colm J. Campbell、Alfonso Castineiras、Kevin B. Nolan
DOI:10.1016/0020-1693(95)04821-9
日期:1996.4
first of a platinum(IV) complex containing deprotonated amide ligands and may serve as a model for platinum(IV)-peptide/protein interactions. The fact that this complex is formed without any added oxidant other than air suggests that deprotonated amide groups facilitate the oxidation of platinum(II) to platinum(IV). The CN and CO bond distances in the coordinated, deprotonated amide groups are almost
摘要1,2-二氨基乙烷-N,N,N',N'-四(N-甲基乙酰胺),L与四氯铂酸钾(II)在水溶液中的反应得到结晶盐(2H + -L)[PtCl4]和中性铂(IV)配合物顺式-Pt(LH-2)Cl2·2H2O。后者的晶体和分子结构表明,氯化物配体为顺式,PtCl= 2.308(2)A,LH-2以四齿配体形式存在,通过其两个氨基氮原子配位,PtN= 2.097 (6)A和两个去质子化的酰胺氮PtN= 2.032(4)A彼此反式。该结构是包含去质子化酰胺配体的铂(IV)配合物的第一个结构,可以用作铂(IV)-肽/蛋白质相互作用的模型。形成这种络合物的事实是没有除空气以外的任何其他氧化剂,这表明去质子化的酰胺基团促进了铂(II)氧化为铂(IV)。配位的,去质子化的酰胺基团中的CN和CO键距几乎与未配位的酰胺基团的CN和CO键距相同,这表明在两种情况下,NCO基团中的π电子离域都相似。