| Abstract |
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The interaction of Fe (III), Pb (II), Co (II), Al (III), La (III), Sr (II), Cr (III), Th (IV), Ti (II) and Zr (IV) ions with tolbutamide (TA) as primary ligand was investigated potentiometrically. The formation constants were determined for a ligand : metal ratio of 1:1 at 25±0.1 °C and I = 0.1 M NaClO4. The stoichiometry of the formed complexes was confirmed by conductometric method. Also, the ionic equilibria of ligand and its complexes with different metal ions in solution were investigated. For ternary complexes, where glycine (Gly) was used as secondary ligand, the protonation constants of the complexes were evaluated for the system M: TA: Gly = 1: 1: 1. The order of stability of the binary and ternary complexes was examined. It was found that glycine adds preferably [M(II)–TA] rather than to the aqueous complexes of M(II). In all cases 1: 1: 1 complex was formed. |
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