Complexation of the uranyl ion with. pi. -acid ligands in aqueous solutions

Journal Article · Mon Sep 01 04:00:00 EDT 1986 · Sov. J. Coordinat. Chem.; (United States)

OSTI ID:6158067

Kobets, L V

The behavior of the uranyl ion in complexation reactions with ..pi..-acid ligands in aqueous and aqueous-organic solutions has been analyzed. It has been shown that between log K/sub st/ of the complexes and the values of the pK/sub a/ of the ligands there is a complex dependence, which can be divided into two linear segments with a discontinuity near pK/sub a/ = 0. A calculation of log K/sub st/ for uranyl complexes has been carried out with the use of the values of parameters which characterize the hardness of the uranyl ion and the basicity of the ..pi..-acid ligand. An evaluation of the level of the electrostatic interaction of UO/sub 2//sup 2 +/ with anions has been carried out, and a formula for calculating the stability constants of complexes with the use of molecular-energetic parameters of the interacting particles has been proposed. Arguments concerning the significant electrostatic contribution to the complexation of the UO/sub 2//sup 2 +/ ion with ..pi..-acid ligands have been advanced on the basis of an analysis of the thermodynamic parameters of the complexation processes. The influence of the hydration of the uranyl cation and the anions on the composition, extent of hydrolysis, and stability of complexes of UO/sub 2//sup 2 +/ in solutions has been discussed.

• OSTI ID: 6158067
• Journal Information: Sov. J. Coordinat. Chem.; (United States), Journal Name: Sov. J. Coordinat. Chem.; (United States) Vol. 11:11; ISSN SJCCD
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACID HYDROLYSIS
ACTINIDE COMPLEXES
ACTINIDE COMPOUNDS
ANIONS
AQUEOUS SOLUTIONS
BINDING ENERGY
CATIONS
CHARGED PARTICLES
CHEMICAL BONDS
CHEMICAL REACTIONS
COMPLEXES
COMPLEXOMETRY
DECOMPOSITION
DISPERSIONS
DOCUMENT TYPES
ELECTRONEGATIVITY
ELECTRONS
ELECTROSTATICS
ELEMENTARY PARTICLES
ENERGY
EQUILIBRIUM
FERMIONS
HYDROGEN COMPOUNDS
HYDROLYSIS
INORGANIC ACIDS
IONIZATION POTENTIAL
IONS
LEPTONS
LEWIS ACIDS
LIGANDS
LYSIS
MATHEMATICAL MODELS
MIXTURES
MOLECULAR STRUCTURE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
REDOX POTENTIAL
REVIEWS
SOLUTIONS
SOLVENTS
SOLVOLYSIS
STABILITY
SYNTHESIS
THERMODYNAMICS
URANIUM COMPLEXES
URANIUM COMPOUNDS
URANYL COMPLEXES
URANYL COMPOUNDS
VALENCE