Distribution diagrams and stability of alanine coordination compounds of FeII and FeIII

IF 1.7 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Russian Chemical Bulletin Pub Date : 2024-10-26 DOI:10.1007/s11172-024-4377-5

G. B. Eshova, Dzh. A. Davlatshoeva, F. Miraminzoda

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Abstract

The formation of mononuclear complexes and a heterovalent compound in the Fe^II—Fe^III—l-Ala—H₂O system was observed when using the Clark—Nikolsky oxidation potential at a temperature of 298.15 K and an ionic strength of the (Na(H)ClO₄) solution equal to 0.75 mol L⁻¹. The method of successive approximations (iteration) of the Yusupov oxidation function was used to calculate the stability and the model parameters of the mononuclear coordination compounds [FeHL(H₂O)₅]³⁺, [Fe(HL)₂(H₂O)₄]³⁺, [Fe₂(HL)₂(OH)₄(H₂O)₆]²⁺, [Fe^IIIFe^II(HL)₂(OH)₄(H₂O)₆]⁺, [FeHL(H₂O)₅]²⁺, [Fe(HL)(OH)(H₂O)₄]⁺, and [Fe(HL)(OH)₂(H₂O)₃]⁰ (L is an alanine ligand), the formation constants of these complexes, to determine the regions where they are dominant and their maximum degrees of accumulation, as well as to plot the diagrams of their distribution as a function of pH. It was determined that the heterovalent complex is the most stable and dominates up to pH 9.5.

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FeII 和 FeIII 的丙氨酸配位化合物的分布图和稳定性

在温度为 298.15 K、(Na(H)ClO4) 溶液的离子强度等于 0.75 mol L-1 的条件下，使用克拉克-尼克尔斯基氧化势，观察到在 FeII-FeIII-l-Ala-H2O 体系中形成了单核配合物和一种杂价化合物。利用尤苏波夫氧化函数的连续近似（迭代）法计算了单核配位化合物 [FeHL(H2O)5]3+、[Fe(HL)2(H2O)4]3+、[Fe2(HL)2(OH)4(H2O)6]2+、[FeIIIFeII(HL)2(OH)4(H2O)6]+、[FeHL(H2O)5]2+ 的稳定性和模型参数、[Fe(HL)(OH)(H2O)4]+、[Fe(HL)(OH)2(H2O)3]0（L 为丙氨酸配体）、这些配合物的形成常数、确定它们的优势区域和最大聚集度，以及绘制它们随 pH 值变化的分布图。结果表明，异价配合物最为稳定，在 pH 值为 9.5 时占主导地位。

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来源期刊

Russian Chemical Bulletin 化学-化学综合

CiteScore

2.70

自引率

47.10%

发文量

257

审稿时长

3-8 weeks

期刊介绍： Publishing nearly 500 original articles a year, by leading Scientists from Russia and throughout the world, Russian Chemical Bulletin is a prominent international journal. The coverage of the journal spans practically all areas of fundamental chemical research and is presented in five sections: General and Inorganic Chemistry; Physical Chemistry; Organic Chemistry; Organometallic Chemistry; Chemistry of Natural Compounds and Bioorganic Chemistry.