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Abstract <p>The formation of mixed-ligand complexes of various compositions in M(II) systems is studied by means of pH-metry and spectrophotometry. <i>L</i>-histidine (His)–L (M = Ni, Zn; L = <i>L</i>-lysine (Lys), <i>L</i>-arginine (Arg)) and their constants of formation were calculated at 298.15 K and ionic strength <i>I</i> = 0.5 mol/L (KNO<sub>3</sub>). The ligand dentacy is estimated on the basis of a comparative analysis of the constants of proportionation reactions, and the most likely way of coordinating amino acid residues in the composition of mixed complexes is suggested.</p>

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Mixed-Ligand Complexation of Nickel(II) and Zinc Cations with Histidine, Lysine, and Arginine in Aqueous Solutions

  • 期刊论文

  • 发表日期：

    2025年8月3日

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  • Y. E. Karaseva,
  • D. F. Pyreu

摘要

Abstract

The formation of mixed-ligand complexes of various compositions in M(II) systems is studied by means of pH-metry and spectrophotometry. L-histidine (His)–L (M = Ni, Zn; L = L-lysine (Lys), L-arginine (Arg)) and their constants of formation were calculated at 298.15 K and ionic strength I = 0.5 mol/L (KNO3). The ligand dentacy is estimated on the basis of a comparative analysis of the constants of proportionation reactions, and the most likely way of coordinating amino acid residues in the composition of mixed complexes is suggested.