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Abstract <p>The complexation in the [ReOCl<sub>5</sub>]<sup>2–</sup>–Ox/Red–HCl system (Ox is bis-<i>N</i>-ethylformamidine disulfide (H<sub>2</sub>DEfds<sup>2+</sup>), and Red is N-ethylurea (Etu)) was studied by potentiometric titration in the temperature range of 273.1–338.1 K, and the <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11504_2025_6305_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="45" /> </InlineMediaObject> <EquationSource Format="TEX">\(\log {{K}_{i}}\)</EquationSource> <!--PhysChA2570199Jamoliddinzoda-m1--> </InlineEquation> values of the complexes were determined. The thermodynamic values of this process (Δ<i>H</i><sup>0</sup>, Δ<i>G</i><sup>0</sup>, and Δ<i>S</i><sup>0</sup>) were calculated using the <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11504_2025_6305_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="45" /> </InlineMediaObject> <EquationSource Format="TEX">\(\log {{K}_{i}}\)</EquationSource> <!--PhysChA2570199Jamoliddinzoda-m2--> </InlineEquation> values. The process exothermicity was found to decrease with an increase in the number of coordinated ligand molecules. The most favorable condition for the formation of stable complexes is the concentration of 4 M HCl; i.e., when the concentration of hydrochloric acid decreases from 6 to 4 M HCl, the stability of the resulting complexes increases.</p>

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Effect of Ionic Strength on the Stability and Thermodynamic Properties of Rhenium(V) Complexes with N-Ethylthiourea

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • F. J. Jamoliddinzoda,
  • J. A. Davlatshoeva,
  • S. M. Safarmamadzoda

摘要

Abstract

The complexation in the [ReOCl5]2––Ox/Red–HCl system (Ox is bis-N-ethylformamidine disulfide (H2DEfds2+), and Red is N-ethylurea (Etu)) was studied by potentiometric titration in the temperature range of 273.1–338.1 K, and the \(\log {{K}_{i}}\) values of the complexes were determined. The thermodynamic values of this process (ΔH0, ΔG0, and ΔS0) were calculated using the \(\log {{K}_{i}}\) values. The process exothermicity was found to decrease with an increase in the number of coordinated ligand molecules. The most favorable condition for the formation of stable complexes is the concentration of 4 M HCl; i.e., when the concentration of hydrochloric acid decreases from 6 to 4 M HCl, the stability of the resulting complexes increases.