Dissociation and Coordinating Ability of 1,2,3,4-Tetrahydro-8-hydroxyquinoline in Aqueous Solution

摘要

The state of 1,2,3,4-tetrahydro-8-hydroxyquinoline is studied spectrophotometrically in the near-UV and visible regions at different pH in an aqueous solution in the presence and absence of Cu~(2+),Zn~(2+),and Cd~(2+)cations.The dissociation constant(pK_1 approx= 5.6(293 K))is estimated from the pH-metric data.The stability of the complexes formed decreases in the series Cu~(2+)> Zn~(2+)> = Cd~(2+).The influence of tetrahydro atoms on the dissociation,complexation,and change in the state of 1,2,3,4-tetrahydro-8-hydroxyquinoline in an aqueous solution is discussed.