KINETICS AND MECHANISM OF THE REDUCTION OF NEPTUNIUM(VI) BY METHYLSALICYLIC ACIDS

被引：0
|
作者：
RAO, LF
CHOPPIN, GR
机构：
来源：
RADIOCHIMICA ACTA | 1991年 / 54卷 / 01期
关键词：
NEPTUNYL; NP(VI); METHYLSALICYLIC ACID; REDOX; KINETICS;
D O I：
暂无
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The kinetics of the reduction of NpO22+ by three methylsalicylic acids (MSA) have been studied with the techniques of solvent extraction and spectrophotometry. The rate constants were found to decrease in the sequence 5-MSA > 3-MSA > 4-MSA. The general rate equation is -d[NpO22+]/dt = k[NpO22+]-[MSA][H+]-1. The activation parameters for these reactions were determined and the values were found to vary in the order: DELTA-H-not-equal 4-MSA > 3-MSA approximately 5-MSA; DELTA-S-not-equal 4-MSA > 3-MSA greater-than-or-equal-to 5-MSA. The rate constant sequence for NpO22+ reduction by various phenolic compounds correlates with the electronic effect of substitution groups on the basicity of the phenolic oxygen.
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页码：21 / 24
页数：4
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