Heteronuclear Complexes FeII, FeIII, and MnII with Acetate Ions

IF 0.8 4区化学 Q4 CHEMISTRY, PHYSICAL

Russian Journal of Physical Chemistry A Pub Date : 2025-09-16 DOI:10.1134/S0036024425701523

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

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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: [Fe^IIIAc(H₂O)₅]²⁺, [Fe^IIIAcOH(H₂O)₄]⁺, [Fe^IIIMn^IIAc(H₂O)₁₁]⁴⁺, [Fe^IIIMn^IIAc(OH)₂(H₂O)₉]²⁺, [Fe^IIAc(H₂O)₅]⁺, [Fe^II(Ace)₂(H₂O)₄]⁰, and [Fe^II(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.

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异核配合物FeII， FeIII和MnII与醋酸离子

采用Clark-Nikol氧化电位，研究了Fe(III) -Fe (II) -Mn (II) -CH3COOH-H2O3体系在298.15 K温度和0.5 mol/L离子强度下的异核络合。结果表明，在pH为2.0 ~ 10的范围内，络合物在体系中形成。七种配位化合物依次形成：[FeIIAc(H2O)5] 2+、[feiiacoh (H2O)4]+、[FeIIIMnIIAc(H2O)11]4+、[FeIIIMnIIAc(OH)2(H2O)9]2+、[FeIIAc(H2O)5]+、[FeII(Ace)2(H2O)4]0和[FeII(Ac)(OH)2(H2O)3]−。其中两个是异核的，而另外三个在内部配位球中含有羟基。铁（II）不参与异核络合物的形成。计算了模型参数以及存在和优势区域，并提出了配合物形成的机理。

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来源期刊

Russian Journal of Physical Chemistry A 化学-物理化学

CiteScore

1.20

自引率

14.30%

发文量

376

审稿时长

5.1 months

期刊介绍： Russian Journal of Physical Chemistry A. Focus on Chemistry (Zhurnal Fizicheskoi Khimii), founded in 1930, offers a comprehensive review of theoretical and experimental research from the Russian Academy of Sciences, leading research and academic centers from Russia and from all over the world. Articles are devoted to chemical thermodynamics and thermochemistry, biophysical chemistry, photochemistry and magnetochemistry, materials structure, quantum chemistry, physical chemistry of nanomaterials and solutions, surface phenomena and adsorption, and methods and techniques of physicochemical studies.