ISSN:
1436-5073
Keywords:
kinetics of complexation
;
azophenol derivatives
;
micellar solution of Triton X-100
;
partition constants
;
copper(II) and nickel(II)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The kinetics of formation of 1∶1 complexes of nickel(II) and copper(II) ions with some azophenol derivatives in aqueous and micellar solution of a nonionic surfactant, Triton X-100, have been studied by a stopped-flow spectrophotometric method. Second order rate constants for the reactions were determined at 298 K and ionic strength 0.1 (NaClO4) in aqueous solution. In the surfactant solution, the pseudo-first-order rate constants for the complexation reactions,k′obs, decreased with increasing the concentration of Triton X-100. This observation was explained by the assumption that the chelating reagents distribute between the micelle of the surfactant and bulk aqueous phase and rate-controlling reactions occur only in the bulk aqueous phase. On the basis of the relation betweenk′obs and the concentration of the surfactant, the partition constants of the reagents between micellar and aqueous phases were determined.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01242701
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