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Abstract

Anions of the phosphineacetic acids of the general formula (C₆H₅)_3-nP(CH₂COOH)_n (n = 1-3) form with the cations Mn²⁺, Co²⁺, Zn²⁺, Cd²⁺, and Pb²⁺ in aqueous solutions complexes with the ratio M : L = 1 : 1 and in some cases also 1 : 2. In addition, the ligand with n = 3 exhibits the formation of the protonized complexes MHL. The stability constants of the complexes were calculated by statistical processing of the pH-metric titration curves, and the ligands were found to act as the O-donors to Mn²⁺ and Zn²⁺, and as PO (n = 1) and POO (n = 2, 3) donors to the other cations.