THERMODYNAMICS OF COMPLEXATION OF THE URANYL(VI) ION WITH BENZOATE - THE CRYSTAL-STRUCTURE OF SODIUM TRIS(BENZOATO) DIOXOURANATE DIHYDRATE, NA[(PHCO2)3UO2].2H2O

被引：18

作者：

BISMONDO, A ^{[1
]}

CASELLATO, U ^{[1
]}

GRAZIANI, R ^{[1
]}

机构：

[1] UNIV PADUA,DIPARTIMENTO CHIM INORGAN,I-35122 PADUA,ITALY

来源：

INORGANICA CHIMICA ACTA | 1994年 / 223卷 / 1-2期

关键词：

CRYSTAL STRUCTURES; THERMODYNAMICS; URANIUM COMPLEXES; OXO COMPLEXES; CARBOXYLATO COMPLEXES;

D O I：

10.1016/0020-1693(94)03978-X

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The stability constant and the enthalpy and entropy changes of formation of the 1:1 complex of uranyl(VI) with benzoate were determined by potentiometric and calorimetric titrations in 1.0 mol dm-3 aqueous solution of NaClO4 at 25-degrees-C. The values obtained for the 1:1 complex agree with the general relationship holding for aliphatic monocarboxylato uranyl(VI) complexes. The structure of Na[UO2L3].2H2O (L = PhCO2-) was determined by X-ray crystallography and refined to R = 0.029 based on 772 unique observed reflections. The compound is orthorhombic, space group Pnna, with a = 9.387(3), b = 9.576(3), c = 26.491(3) angstrom. Three ligands are equatorially chelated to the uranyl group forming UO2L3- anions with C2 crystallographic symmetry. The Na+ cations, which also lie on two-fold axes, form approximate coordination octahedrons with oxygen atoms of water molecules and neighbouring anions.

引用

页码：151 / 153

页数：3

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