SOLUTION EQUILIBRIUM STUDIES ON METAL COMPLEXES WITH BENZOFURAN SCHIFFS BASE

The dissociation constant of ligand (HL) where L is 3-methoxy-2-benzofuran [2 -hydroxynapthyl] carbohydrazide (MBHNC) was determined pH metrically. The stability constant of the complexes formed between Co(II), Ni(II), Cu(II), Cd(II), Zn(II), Hg(II), UO2(VI) and Th(IV) have been determined using Irving- Rossotti pH titration technique in 70:30 %(v/v) alcohol-water medium at 30 ± 1°C temperature and at constant ionic strength of 0.1 M NaClO4. The correlation between log K, values and some of the fundamental properties of the central metal ions are discussed.