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Effects of nonionic, cationic, and anionic micelles on the kinetics of the complexation reaction of nickel (II) with pyridine-2-azo-p-dimethylaniline

✍ Scribed by Antonio I. Carbone; F. Paolo Cavasino; Emanuele Di Dio; Carmelo Sbriziolo

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
628 KB
Volume
18
Category
Article
ISSN
0538-8066

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✦ Synopsis

The stopped-flow technique has been used to study the effect of cationic (CTAN), nonionic (Triton X-loo), and anionic (SDS) micelles on the rate of the reaction between nickel(I1) ion and the ligand pyridine-2-azo-p-dimethylaniline (PADA) at 20.0"C and ionic strength 0.03 mol dm-3. The complex formation reaction is markedly inhibited by both CTAN and Triton X-100 micelles. The kinetic data are found to conform to a reaction mechanism which implies only partitioning of the ligand between water and the micellar phase, the estimated binding constant of PADA being significantly larger in the presence of CTAN aggregates. Anionic micelles strongly speed the complexation reaction, which occurs in the micellar phase with the same rate and the same mechanism as in water. The extent of binding of PADA to anionic micelles is similar to that found for the cationic micellar aggregates.

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