Study of Complex Formation Between Iodoquinol (IQ) and Co²⁺ , Mn²⁺, Cd²⁺, Pb²⁺ and Zn²⁺ Cations in Binary Aqueous / Non-aqueous Solvent Using Spectrophotometry

Abstract

The complexation reactions between iodoquinol and Co²⁺, Mn²⁺, Cd²⁺, Pb²⁺ and Zn²⁺ cations were studied in different DMF/H₂O binary mixtures at the ionic strength of 0.1(using NaNO₃).The spectrophotometric method was used for the determination of formation constants and the stoichiometries. The stoichiometry of the complexes is established 1:1 by Job's and mole ratio methods. It was found that the stability constants of the complex formed between the ligand (IQ) and the cations in the all cases increase with increasing of the non-aqueous solvent. In the most cases the maximum formation constants between Zn²⁺ ion and IQ were obtained respect to the other cations.