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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
Author(s) -
Carbone Antonio I.,
Cavasino F. Paolo,
Di Dio Emanuele,
Sbriziolo Carmelo
Publication year - 1986
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550180602
Subject(s) - chemistry , cationic polymerization , micelle , nickel , pyridine , ionic strength , dimethylaniline , ligand (biochemistry) , kinetics , inorganic chemistry , triton x 100 , photochemistry , medicinal chemistry , polymer chemistry , organic chemistry , pulmonary surfactant , aqueous solution , biochemistry , physics , receptor , quantum mechanics
The stopped‐flow technique has been used to study the effect of cationic (CTAN), nonionic (Triton X‐100), andanionic (SDS) micelles on the rate of the reaction between nickel(II) 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 dataare found to conform to a reaction mechanism which implies only partitioning of the ligand between water and the micellar phase, the estimated bindingconstant 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.