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Abstract <p>Heteronuclear complexation in the Fe(III)–Fe(II)–Mn(II)–CH<sub>3</sub>COOH–H<sub>2</sub>O<sub>3</sub> system is studied using the Clark–Nikol’skii oxidation potential at a temperature of 298.15 K and an ionic strength of 0.5&#xa0;mol/L. It is shown that complexes form in the system in the pH range of 2.0 to 10. Seven coordination compounds form sequentially: [Fe<sup>III</sup>Ac(H<sub>2</sub>O)<sub>5</sub>]<sup>2+</sup>, [Fe<sup>III</sup>AcOH(H<sub>2</sub>O)<sub>4</sub>]<sup>+</sup>, [Fe<sup>III</sup>Mn<sup>II</sup>Ac(H<sub>2</sub>O)<sub>11</sub>]<sup>4+</sup>, [Fe<sup>III</sup>Mn<sup>II</sup>Ac(OH)<sub>2</sub>(H<sub>2</sub>O)<sub>9</sub>]<sup>2+</sup>, [Fe<sup>II</sup>Ac(H<sub>2</sub>O)<sub>5</sub>]<sup>+</sup>, [Fe<sup>II</sup>(Ace)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>]<sup>0</sup>, and [Fe<sup>II</sup>(Ac)(OH)<sub>2</sub>(H<sub>2</sub>O)<sub>3</sub>]<sup>−</sup>. Two of these are heteronuclear, while the other three more contain hydroxyl groups in the inner coordination sphere. Fe(II) does not participate in the formation of heteronuclear complexes. Model parameters are calculated along with areas of existence and dominance, and mechanisms are proposed for the formation of complexes.</p>

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Heteronuclear Complexes FeII, FeIII, and MnII with Acetate Ions

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • M. B. Zhorobekova,
  • E. F. Faizullozoda,
  • M. Rakhimova,
  • F. Miraminzoda

摘要

Abstract

Heteronuclear complexation in the Fe(III)–Fe(II)–Mn(II)–CH3COOH–H2O3 system is studied using the Clark–Nikol’skii oxidation potential at a temperature of 298.15 K and an ionic strength of 0.5 mol/L. It is shown that complexes form in the system in the pH range of 2.0 to 10. Seven coordination compounds form sequentially: [FeIIIAc(H2O)5]2+, [FeIIIAcOH(H2O)4]+, [FeIIIMnIIAc(H2O)11]4+, [FeIIIMnIIAc(OH)2(H2O)9]2+, [FeIIAc(H2O)5]+, [FeII(Ace)2(H2O)4]0, and [FeII(Ac)(OH)2(H2O)3]−. Two of these are heteronuclear, while the other three more contain hydroxyl groups in the inner coordination sphere. Fe(II) does not participate in the formation of heteronuclear complexes. Model parameters are calculated along with areas of existence and dominance, and mechanisms are proposed for the formation of complexes.