The kinetics of exchange between a lanthanide ion and the gadolinium complex of N,N''-bis(2-methoxyethylamide-carbamoylmethyl)diethylenetriamine-N,N',N''-triacetate

被引：15

作者：

Rothermel, GL ^{[1
]}

Rizkalla, EN ^{[1
]}

Choppin, GR ^{[1
]}

机构：

[1] FLORIDA STATE UNIV,DEPT CHEM,TALLAHASSEE,FL 32306

来源：

INORGANICA CHIMICA ACTA | 1997年 / 262卷 / 02期

关键词：

kinetics and mechanisms; lanthanide complexes; gadolinium complexes; aminopolycarboxylate complexes;

D O I：

10.1016/S0020-1693(97)05513-8

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The exchange kinetics of Gd(DTPA-BMEA) with the radioactive tracer Eu(III) have been studied in aqueous solution of 0.15 M ionic strength and 25 degrees C. The exchange is a first-order reaction with the rate expression containing both acid-dependent and acid-independent terms. At pH > 6, the exchange is governed by direct reaction of Eu(III) ions with Gd(DTPA-BMEA), while below pH 6, the rate determining step is proton-catalyzed dissociation of the complex with a first-order dependence on [H+]. The relatively slow association and dissociation of the Ln(DTPA-BMEA) complexes can be attributed to steric effects related to the binding of the two methoxyethylamide groups.

引用

页码：133 / 138

页数：6

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