Potentiometric studies of some bivalent metal ion complexes of N‐p‐tolyl‐p‐methoxybenzohydroxamic acid (p‐T‐p‐MBHA)

Abstract

AbstractThe complexes of N‐p‐tolyl‐p‐methoxybenzo hydroxamic acid with Cu(II), Zn(II), Ni(II) and Mn(II) are studied by potentiometric titration in the mixtures 50, 60 and 70 vol % dioxane and respectively 50, 40 and 30 vol % water at 25 and 35°C · 0.1°C. The thermodynamic ionisation constants of p‐T‐p‐MBHA are reported in the mixtures 10, 20, 30, 40, 45, 50, 60 and 70 vol % dioxane and respectively 90, 80, 70, 60, 55, 50, 40 and 30 vol % water. The order of stability of the complexes and the effect of solvent on the formation constant are discussed.