title: Acid-base and distribution equilibria of 5,7-dichloro-2-methyl-8-hydroxyquinoline in Brij-35 micellar media solutions.
abstract: The acid-base equilibria of 5,7-dichloro-2-methyl-8-hydroxyquinoline (HQ) have been examined spectrophotometrically in aqueous micellar solution of the non-ionic surfactant Brij-35. The differences between apparent pK(a) values at different surfactant concentrations can be quantitatively explained in terms of the extraction constants of the neutral species HQ and the ion-pair Na(+)Q(-). Calculations have been performed by means of SPDIS program, developed in this work to handle multiwavelength spectrophotometric data in micellar systems.
authors.affiliation: Departament de Química Analítica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain.
authors.forename: J L
authors.initials: JL
authors.lastname: Beltrán
authors.forename: R
authors.initials: R
authors.lastname: Codony
authors.forename: M
authors.initials: M
authors.lastname: Granados
authors.forename: A
authors.initials: A
authors.lastname: Izquierdo
authors.forename: M D
authors.initials: MD
authors.lastname: Prat