Potentiometric Studies on the Binding Properties of Protons, Some Divalent and Tervalent Metal Ions with 2-Nitroso-5-(N-propyl-3-sulfopropylamino)phenol

Abstract

The first and second protonation constants of 2-nitroso-5-(N-propyl-3-sulfopropylamino)phenol (NPSAP, H₂L) and the stability constants of the metal ion complexes formed by NPSAP with some divalent and tervalent metal ions such as magnesium(II), calcium(II), cobalt(II), nickel(II), copper(II), zinc(II), aluminium(III), iron(III) and gallium-(III) have been determined potentiometrically in aqueous solution at 25°C (μ=0.1 with KNO₃).