The Impact of Solvents on the Stability of Complexes of Cd(II) With L-Tyrosine in Aqueous-Organic Solvent Mixtures

Santosh Kumar and O. D. Gupta*

Department of Chemistry, University of Rajasthan, Jaipur - 302 055 (India).

The polarographic study of Cd(II) with L-Tyrosine has been investigated in aqueous organic solvent mixtures at 300K. The Dimethyl sulphoxide and Dimethyl formamide solvents have been used with water to study the effect of solvents on the stability of complexes. Cadmium(II) formed 1:1, 1:2 and 1:3 complexes with L-Tyrosine in the aqueous-organic solvent mixture i.e. DMSO and DMF. The stability constants of the water DMSO solvent mixtures are higher than water-DMF solvent mixtures due to the higher dielectric constant of DMSO than DMF. DeFord and Hume’s method has been applied for the determination of stability constants of complex species. The values of overall formation constants were also determined by the mathematical method (Mihailov method) in order to compare the values.

Cadmium (II); L-Tyrosine; Polarography dropping mercury electrode; Effect of solvents; Mihailov’s method