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Steric and hydrophobic effects of substituents in extraction of metal complexes withO,O-dialkyldithiophosphoric acids

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
34
Issue
1
Identifiers
DOI: 10.1016/0039-9140(87)80029-2

Abstract

Abstract The two-phase stability constants (equilibrium constants) of metal complexes MA n [M n + = Ni(II), Zn(II), Cd(II), Pb(II), Tl(I), In(III)] with a series of O,O-dialkyldithiophosphoric acids in the system water—organic solvent) have been determined. By use of correlation analysis the role of the steric and hydrophobic effects of the substituents at the phosphorus atom on the stability constant β n and distribution constant P of the complexes has been elucidated. The data obtained are of use for determining the relationships in the influence of structure of a reagent on its extraction properties and on the conditions for practical application of O,O-dialkyldithiophosphoric acids for metal extraction.

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