The kinetics and mechanism of the reaction of U(VI) with 4-(2-pyridylazo) resorcinol (PAR)

Ekstrom, A.; Johnson, D.A.

doi:10.1016/0022-1902(74)80470-7

Cited by 13 publications

(1 citation statement)

References 20 publications

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“…1. We have included our results on the phosphonate systems, Arsenazo III, and a literature report on the complexation rate of uranyl by pyridylazoresorcinol (PAR) [22], It appears that the reactions of UO| + and NpOJ with the methane diphosphonate species (MDPA and HEDPA) are correlated (isokinetic temperature 239(±5) K) and those of the dioxocations with Chlorophosphonazo III and Arsenazo ΙΠ are correlated (isokinetic temperature 313(±77) K). The UOi + complexes with ethane-1,2-diphosphonic acid and PAR do not appear to be consistent with either of these correlations.…”

Section: Discussionmentioning

confidence: 95%

Kinetic Study of the Reactions of Np(V) and U(VI) with Diphosphonic Acids in Acetate Buffer Solutions

Fugate¹,

Nash²,

Sullivan³

1997

Radiochimica Acta

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The results of kinetic investigations for the reactions of Np(V) and U(VI) with methanediphosphonic acid (MDPA), 1-hydroxyethane-1,1-diphosphonic acid (HEDPA), and of Np(V) with Arsenazo III in acetate buffer media (/ = 0.1 M) are presented. Rate and activation parameters have been determined for the complex formation reaction of Np(V) with Arsenazo III, complex formation between U(VI) and the diphosphonate ligands, and for both formation and dissociation reactions of the Np(V)-diphosphonate complexes. The activation parameters are generally consistent with an associative mechanism for complex formation and dissociation reactions in all systems. Isokinetic plots suggest a common mechanism for the actinyl (V and VI) reactions with MDPA and HEDPA. A distinct isokinetic relationship exists for the actinyl derivatives of chromotropic acid derivatives Arsenazo III and Chlorophosphonazo III. In acetate buffer media, Np(V) reacts more rapidly with the diphosphonate ligands than U(VI) despite its lower formal charge and the smaller thermodynamic driving force for complex formation.

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Section: Discussionmentioning

confidence: 95%