Potentiometric Studies on Chelation of Cu(II), Ni(II), Co(II) and Fe(II) with o-Vanillinsemicarbazone

Abstract

Chelate formation of Cu(Il), Ni(Il), Co(II) and Fe(ll) with o-vanillinsemicarbazone
in H₂O-DMF medium (1 :1) at constant ionic strength
(μ = 0.1 M KNO₃) and at constant temperature of 25 ± 0.1 °C has been
studied potentiometrically. The proton-ligand and metal-ligand stability
constants were determined by Irving-Rossotti pH-metric titration technique.
The results were discussed in details with reference to the results
already reported in the literatures. The order of stability constant with
respect to metal ions folIowed the natural order.