Formation of alaninate complexes of Fe(II) at various ionic strengths of the solution

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Abstract

The complexation in the Fe(0)–Fe(II)–L-Ala–Na(H)ClO4–H2O system was studied at a temperature of 298.15 K and the ionic strength of the Na(H)ClO4 solution I = 0.1–1.0 mol/L (cFe(II) = 1·10–3 and cL = 1·10–2 mol/l) in the range of pH = 1.0–8.2. The constants of complex formation were calculated by the method of successive approximation of theoretical and experimental oxidation functions. Based on the Debye–Huckel theory, the dependence of the constant of complex formation on the ionic strength of the solution was established. It was found that with an increase in the ionic strength of the solution, the values of the constants of formation of the forming coordination compounds decrease.

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G. B. Bobonazarzoda

Research Institute of the Tajik National University

Author for correspondence.
Email: eshova81@mail.ru
Tajikistan, Dushanbe, 734025

References

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2. Fig. 1. Dependence of EMF on pH in the Fe(0)–Fe(II)–L-Ala–Na(H)ClO4–H2O system at 298.15 K and different values ​​of the ionic strength of the Na(H)ClO4 solution (cFe(II) = 1 10–3 and cL = 1 10–2 mol/l). I = 0.10 (1), 0.25 (2), 0.50 (3), 0.75 (4), 1.00 mol/l (5).

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3. Fig. 2. Dependence of the EMF of the Fe(0)–Fe(II)–L-Ala–Na(H)ClO4–H2O system on pсox at 298.15 K and the ionic strength of the Na(H)CIO4 solution I = 0.10 mol/l (сL = 1 10–2 mol/l). pH = 4.5 (1), 6.5 (2), 7.5 (3), 8.0 (4).

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4. Fig. 3. Dependence of the EMF of the Fe(0)–Fe(II)–L-Ala–Na(H)ClO4–H2O system on рсL at 298.15 K and ionic strength of Na(H)CIO4 solution I = 0.10 mol/l. pH = 2.0 (1), 4.0 (2), 8.0 (3), 5.5 (4).

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5. Fig. 4. Dependences of the logarithmic values ​​of the experimental fэ (1) and theoretical fт (2) oxidation functions on pH for the Fe(0)–Fe(II)–L-Ala–Na(H)ClO4–H2O system at 298.15 K, ionic strength of the Na(H)CIO4 solution I = 0.10 (cFe(II) = 1 10–3 and cL = 1 10–2 mol/l).

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6. Fig. 5. Dependence of the degree of accumulation of complexes on pH for the Fe(0)–Fe(II)–L-Ala–Na(H)ClO4–H2O system at 298.15 K, ionic strength of Na(H)CIO4 solution I = 0.10 mol/L (cFe(II) = 1 10–3 and cL = 1 10–2 mol/L). 1 – [Fe(H2O)6]2+, 2 – [Fe(OH)(H2O)5]+, 3 – [FeL(H2O)5]+, 4 – [FeL(OH)(H2O)4]0, 5 – [Fe(OH)2(H2O)4]0, 6 – [Fe(HL)L–(H2O)4]+.

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7. Fig. 6. Dependence of the constants of formation of Fe(II) complex compounds on the ionic strength of Na(H)ClO4 solution I = 0.1–1.0 mol/L in the Fe(0)–Fe(II)–L-Ala–Na(H)ClO4–H2O system at 298.15 K (cFe(II) = 1 10–3 and cL = 1 10–2 mol/L). 1 – [FeL(H2O)5]+, 2 – [Fe(OH)(H2O)5]+, 3 – [Fe(OH)2(H2O)4]0, 4 – [FeL(OH)(H2O)4]0, 5 – [Fe(HL)L–(H2O)4]+.

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