Rate enhancement of the nickel(II)-pada complex formation in sodium alkanesulfonate micellar solutions

Abstract

Sodium alkanesulfonates (C₉, C₈, C₇, and C₆) in micellar solution have been used to enhance the rate of reaction between Ni_aq²⁺ and the bidentate ligand pyridine-2-azo-p-dimethylaniline (pada) at 298.2 K. A Berezin-like model has been used to account for the observed kinetic constants in terms of the binding constants of each of the reagents to the micelles and the reaction volume and the concentration of the micellar surfactant. For a given chain length, the alkanesulfonates are about 25 % less effective than alkyl sulfates in promoting the rate of reaction and the model accounts for this successfully.