Kinetics of replacement of aminocarboxylates by macrocyclic polyamines in copper(II) complexes
作者:Mutsuo Kodama、Eiichi Kimura
DOI:10.1039/dt9780000247
日期:——
The rate constants have been determined for the reaction of macrocyclic polyamine ligands and their protonated forms with [Cu(ida)], [Cu(nta)]–, [Cu(hedta)]–, and [Cu(edta)]2–[ida = iminodiacetate, nta = nitrilotriacetate, hedta =N-(2-hydroxyethyl)ethylenediamine-NN′N′-triacetate, and edta = ethylenediaminetetra-acetate]. The macrocyclic ligands include 1,4,7,10-tetra-azacyclotridecane, 1,4,8,12-t
已经确定了大环多胺配体及其质子化形式与[Cu(ida)],[Cu(nta)] –,[Cu(hedta)] –和[Cu(edta)] 2–的反应的速率常数。[IDA =亚氨基二乙酸,NTA次氮基三乙=,HEDTA = ñ - (2-羟乙基)乙二胺NN ' ñ'-三乙酸酯,和edta =乙二胺四乙酸酯]。大环配体包括1,4,7,10-四氮杂环十五烷,1,4,8,12-四氮杂环十五烷和1,4,7,10,13-五氮杂环十五烷。这些配位体置换反应证明了具有不同环尺寸和密度的大环多胺的质子化作用。由[Cu(ida)]或[Cu(nta)]形成大环络合物的过程与由Cu 2+形成的过程一样快(有时甚至更快)。(aq),尽管前一个反应需要替换强配位的氨基羧酸酯配体。未质子化或质子化大环的反应速率反过来取决于氨基羧酸盐配合物的稳定性常数,这表明速率确定步骤是氨基羧酸盐从铜中的ida片段的断裂。与对应的线性多胺相