Author(s)

Awad A. Al-Rashdi^1*, A. H. Naggar², O. A. Farghaly², H. A. Mauof³, A. A. Ekshiba³

¹Chemistry Department, Al-Qunfudah Center for Scientific Research (QCSR), Al-Qunfudah University College, Um Al-Qura University, Al-Qunfudah, Saudi Arabia.
²Department of Chemistry, Faculty of Science, Al-Azhar University, Assiut, Egypt.
³Department of Chemistry, Faculty of Science, Sebha University, Sebha, Libya.

Binary and ternary complexes of (Fe(III), Pb(II), Co(II), Al(III), La(III), Sr(II), Cr(III), Ti(II) and Zr(II)) with sulphathiazole (as primary ligand) and amino acid glycine (as secondary ligand) have been studied potentiometrically at 25°C ± 0.1°C and I = 0.1 M NaClO₄ in 25% (v/v) pure ethanol-water medium. Although there are many methods available to study the stability of metal-ligand complexes, pH-metry is most frequently used. In extension of our study on solution equilibria, we used Calvin-Bjerrum method for the calculation of stability constants. Stoichiometries and stability constants of binary systems containing the above metal ions in a 1:1 and 1:2 and/or 1:3 ratios were also determined to compare the effect of the secondary ligand on (1:1) Metal:Sulphathiazole system. The protonation constants of the complexes were evaluated for the system M:Sulphathiazole:Glycine = 1:1:1. The order of stability of the binary and ternary complexes was examined. It was found that glycine adds preferably [M-Sulfathiazole] rather than to the aqueous complexes of metal ions. In all cases 1:1:1 complex was formed.

Potentiometry, Glycine, Sulphathiazole, Ternary Complexes

Al-Rashdi, A. , Naggar, A. , Farghaly, O. , Mauof, H. and Ekshiba, A. (2018) Potentiometric Determination of Stability Constants of Sulphathiazole and Glycine-Metal Complexes. American Journal of Analytical Chemistry, 9, 99-112. doi: 10.4236/ajac.2018.93009.