Cation-cation interactions between NpO2+ and UO22+ at different temperatures and ionic strengths

被引：10

作者：

Xian, Liang ^{[1
,2
]}

Tian, Guoxin ^{[1
]}

Zheng, Weifang ^{[2
]}

Rao, Linfeng ^{[1
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA

[2] China Inst Atom Energy, Dept Radiochem, Beijing, Peoples R China

来源：

DALTON TRANSACTIONS | 2012年 / 41卷 / 28期

关键词：

PENTAVALENT ACTINIDES; VARIABLE TEMPERATURES; PERCHLORATE SOLUTIONS; STRONG ELECTROLYTES; COMPLEXES; NEPTUNIUM(V); EQUILIBRIA; KINETICS; NP(V); NP(V)-CR(III);

D O I：

10.1039/c2dt30736g

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Cation-cation interactions between NpO2+ and UO22+ were studied at different temperatures (283.15 K to 358.15 K) and different ionic strengths (3-4.5 mol dm(-3)) by spectrophotometry and microcalorimetry. The cation-cation complex between NpO2+ and UO22+ was weak and became stronger as the temperature was increased from 283.15 K to 358.15 K. The molar enthalpy of complexation was directly determined for the first time by microcalorimetry to be (4.2 +/- 1.6) kJ mol(-1) at 298.15 K, in good agreement with the trend in the stability constant at different temperatures. The small and positive enthalpy and entropy of complexation support the argument that the cation-cation complex between NpO2+ and UO22+ is of inner-sphere type. At each temperature, the stability constants of the cation-cation complex were found to increase as the ionic strength was increased. The specific ion interaction theory (SIT) was used to obtain the stability constants at infinite dilution and variable temperatures.

引用

页码：8532 / 8538

页数：7

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