Study on partition equilibria of metal complexes in non-ionic micellar solutions from spectrophotometric data

The complexation equilibria for Zn(II)-8-quinolinol and Zn(II)-5,7-dichloro -2-methyl-8-quinolinol systems were studied spectrophotometrically in aqueo us micellar solutions of the non-ionic surfactant Brij-35 in NaCl 0.1 M med ium at 25 degrees C. The partition model, in which the different species in volved in the equilibria can distribute themselves between aqueous and mice llar pseudophases, was applied. Calculations were performed by means of the SPDIS program, developed specifically to handle multiwavelength spectropho tometric data in micellar systems. A factor analysis was applied to the spe ctrophotometric data in order to determine the number of species in equilib rium. A quantitative relationship was found between fluorescence intensity and the micellar solubilization of metal chelates. (C) 2000 Elsevier Scienc e B.V. All rights reserved.