FORMATION OF CHROMIUM(III) COMPLEXES WITH 8-HYDROXYQUINOLINE DERIVATIVES IN NONIONIC MICELLAR SOLUTIONS

Due to the inertness of hydrated chromium ion, chromium(III) complexes are formed very slowly in aqueous solutions but not in surfactant sol utions. Micelle effects were observed in the reaction of chromium(III) ion with 8-hydroxyquinoline or its derivatives. In nonionic surfactan t solutions, reactions between chromium(III) ion and 8-hydroxyquinolin e at 23EC and 40 EC followed first-order kinetics. The reaction betwee n chromium(III) ion and Kelex 100, 7-(4-ethyl-1-methyloctyl)-8-hydroxy quinoline, was zero order, and was much slower than the unsubstituted chelating agent. The rate of formation of the chromium(III)-Kelex 100 complex was dependent upon the surfactant concentration.