Potentiometric Determination of Formation Constants of Metal Ion Complexes with Schiff Bases of 4,5-Dimethyl Salicylaldehyde.

Abstract

In the present research work an attempt is made to calculate the
stability constants of the metal complexes formed with the Schiff bases
of 4,5-dimethyl salicylaldehyde.  A potentiometric study
has been carried out on metal complexes of Cu²⁺, Zn²⁺, Co²⁺,
Ni²⁺, Ca²⁺, Mg²⁺ with N-[4,5-dimethyl salicylidene] aniline,
N-[ 4,5-dimethyl salicylidene]-4-chloroaniline, N-[4,5-dimethyl
salicylidene ]-4-methoxyaniline, N-[ 4,5-dimethyl salicylidene ]-4-
methy laniline. The stability constants of these reagents and their
bivalent metal ion chelates have been determined by Calvin Bjerrum
pH titration technique as adopted by Irving and Rossotti
at 303 ± 1K and at ionic strength of 0.1 M in 75 : 25 (v/v) dioxanewater
medium.  All the synthesized complexes were also screened
for their antibacterial activity.