What question did this study set out to answer?

The central aim is to investigate the formation of mixed-ligand complexes involving nickel(II) and zinc cations with specific amino acids.

March 1, 2026

Mixed Ligand Complex Construction of Nickel(ii) and Zinc Cations With Histidine, Lysine and Arginine in Aqueous Solution

Key Points

The central aim is to investigate the formation of mixed-ligand complexes involving nickel(II) and zinc cations with specific amino acids.
Utilized pH-metry and spectrophotometry techniques.
Studied different compositions of ligands in aqueous solutions.
Calculated formation constants at 298.15 K with an ionic strength of 0.5 mol/L.
Determined formation constants for the mixed-ligand complexes.
Evaluated the dentativity of ligands based on comparative analysis.
Proposed a probable coordination mechanism for amino acid residues in complexes.

Abstract

The formation of mixed-ligand complexes of different composition in the systems M(II) – L-histidine (His) – L (M = Ni, Zn; L = L-lysine (Lys), L-arginine (Arg)) has been studied by pH-metry and spectrophotometry methods and their formation constants have been calculated at 298.15 K and ionic strength = 0.5 mol/L (KNO). Based on the comparative analysis of the coproportioning reaction constants, the dentativity of the ligands was evaluated and the most probable way of coordination of amino acid residues in the mixed complexes was proposed.

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Mixed Ligand Complex Construction of Nickel(ii) and Zinc Cations With Histidine, Lysine and Arginine in Aqueous Solution

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