Collect. Czech. Chem. Commun. 1979, 44, 2460-2464

Stability constants of phosphineacetate complexes of divalent metals

Jana Podlahov√°

Department of Inorganic Chemistry, Charles University, 128 40 Prague 2


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.