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Abstract <p>The complexation behavior of the Fe(II)–1-methyl-2-mercaptoimidazole system was investigated through oxidation potential measurements across a range of ionic strengths and temperatures. Based on these investigations, both chemical and mathematical models were developed to describe the ionic equilibria involved in the complex formation. The analysis identified the formation of four distinct Fe(II) complex species: [FеHmerc(H<sub>2</sub>О)<sub>5</sub>]<sup>2+</sup>; [Fеmerc(H<sub>2</sub>О)<sub>4</sub>]<sup>+</sup>; [FеНmerc(H<sub>2</sub>О)<sub>3</sub>ОH]<sup>0</sup>; and [Fе(merc)<sub>2</sub>(H<sub>2</sub>О)<sub>2</sub>]<sup>0</sup> at 318 K and an ionic strength of 0.5 mol/L (Na<sub>2</sub>SO<sub>4</sub>). The formation constants of these complexes were determined through oxidation function analysis. Furthermore, the chemical composition of the complexes was characterized over a range of pH values, and optimal conditions for achieving the maximum yield of Fe(II)–1-methyl-2-mercaptoimidazole complexes were established.</p>

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Investigation of Complex Formation Processes in the Fe(II) with 1-Methyl-2-mercaptoimidazole System by Oxidation–Reduction Method at T = 318 K and Different Ionic Strengths

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • S. G. Yormamadova,
  • I. U. Kamolzoda,
  • U. Rajabov,
  • O. I. Shomirzoeva,
  • G. B. Bobonazarzoda

摘要

Abstract

The complexation behavior of the Fe(II)–1-methyl-2-mercaptoimidazole system was investigated through oxidation potential measurements across a range of ionic strengths and temperatures. Based on these investigations, both chemical and mathematical models were developed to describe the ionic equilibria involved in the complex formation. The analysis identified the formation of four distinct Fe(II) complex species: [FеHmerc(H2О)5]2+; [Fеmerc(H2О)4]+; [FеНmerc(H2О)3ОH]0; and [Fе(merc)2(H2О)2]0 at 318 K and an ionic strength of 0.5 mol/L (Na2SO4). The formation constants of these complexes were determined through oxidation function analysis. Furthermore, the chemical composition of the complexes was characterized over a range of pH values, and optimal conditions for achieving the maximum yield of Fe(II)–1-methyl-2-mercaptoimidazole complexes were established.