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Potentiometric Investigation on Complex Formation and Stabilities of Some Divalent Metal Ions with l-Cysteine and Glycine as Ligands in Aqueous Solutions

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Abstract

Complexes of the divalent metal ions, Ca2+ and Zn2+ with the bio-relevant α-amino acids, l-cysteine and glycine were investigated by means of the potentiometric technique. The dissociation constants of the bio-ligands were determined and used for determining the stability constants of their binary and ternary complexes formed in aqueous solutions at 25 ± 0.1 °C and constant ionic strength of 0.20 mol·dm−3 NaNO3. The acid–base properties of glycine were investigated at different ionic strengths, ranging from 0.01 to 0.30 mol·dm−3 NaNO3 at 25.0 ± 0.1 °C. The concentration distribution of the different glycine species formed in solution due to variation of pH was evaluated and discussed. The formation of the different 1:1 and 1:2 binary complexes and 1:1:1 ternary complexes were inferred from the potentiometric pH-metric titration curves. The ternary complex formation occurred in a stepwise manner with l-cysteine acting as the primary ligand. The stability constants of these binary and ternary complex systems were evaluated. The ∆log10 K values, percentage of relative stabilization (%R.S.) and log10 X for the ternary complexes were evaluated and are discussed.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Beni Suef University, Beni Suef, 62518, Egypt

    Abdelatty Mohamed Radalla

  2. Department of Physics, College of Science and Arts in Al-Mithnab, Qassim University, Buridah, Al-Mithnab, 51931, Kingdom of Saudi Arabia

    Abdelatty Mohamed Radalla

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Radalla, A.M. Potentiometric Investigation on Complex Formation and Stabilities of Some Divalent Metal Ions with l-Cysteine and Glycine as Ligands in Aqueous Solutions. J Solution Chem 50, 954–967 (2021). https://doi.org/10.1007/s10953-021-01100-8

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