Complex Formation Reactions of Scandium(ΙΙΙ), Yttrium(ΙΙΙ) and Lanthanum(ΙΙΙ) Complexes with 8−Hydroxyquinoline

This study aims to investigate the nature and types of complexes formed in aqueous solution between 8-Hydroxyquinoline (HQ) and the ions of Sc+3, Y+3, and La+3. Potentiometric titration was used to follow the formation of complexes. The coordination compounds formed were studied through the determination of stability constants of these complexes in aqueous solution at 25,0 ± 0,1ºC and ionic strength of 0,1 M KNO3. The basicity of the ligand was also assessed by the determination of the dissociation constants of the ligand. All of the constants were determined by computer refinement of pH-volume data using the BEST computer program. Distribution diagrams for the species were drawn showing the concentrations of individual species as a function of pH by the SPE software program.