Investigation of Complex Formation Processes in the Fe(II)--Mercazolyl--Н₂O System using Oxidmetry

Abstract

The processes of complex formation of iron(II) with mercazolyl at a temperature of 288.15 K and an ionic strength of 1.0 mol/l were studied by the Clark --- Nikolsky oxidation potential method. An analysis of the obtained experimental dependences of the oxidation potential φ on pH made it possible to determine the range of complex formation processes on the pH scale and the existence of iron(II) coordination compounds with mercazolyl (Merk) on the pH scale. The composition and areas of dominance of the resulting coordination compounds were determined. On the basis of oxenometric measurements of the system under study, according to the expected composition of the complexes, it was compiled. stoichiometric matrix, resulting complex forms. Using the oxidizing function, the thermodynamic conditions of the mono-nuclear mercasolilate complex of iron(II) were deter-mined, which has the highest numerical values of the formation constant. It has been established that [Fe(L)₂(H₂O)₂]²⁺; [FeL(H₂O)₃]²⁺; [FeL(H₂O)₂OH]⁰; [FeHL(H₂O)₂OH]⁺; [FeHL(H₂O)₃]²⁺ (L --- mercazolyl). The complex formation constants were determined using the oxidizing function. With the help of the oxidizing Yusufov’s function. The composition and formation constants of coordination compounds and their degree of accumulation in the system under study were refined by iteration. To determine the regions of existence of the resulting complexes, diagrams of the distribution of complexes and the equilibrium form of iron(II) versus pH were plotted

Please cite this article in English as:

Ermamadova S.G., Rajabov U., Kamolova I.U. Investigation of complex formation processes in the Fe(II)--mercazolyl--Н₂O system using oxidmetry. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2023, no. 6 (111), pp. 70--82 (in Russ.). DOI: https://doi.org/10.18698/1812-3368-2023-6-70-82

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