INFLUENCE OF CONCENTRATION PARAMETERS OF SOLUTION OF THE HOMOGENEOUS SYSTEM FE(II) - FE(III) - GLYCINE - NA(H)CLO4 - H2O ON THE COMPOSITION OF COMPLEXES FORMED
Abstract and keywords
Abstract (English):
We studied the complexation processes in the system Fe(II) - Fe(III) - glycine - Na(H)ClO4 - H2O at temperature 308.16 K, solution ionic strength 0.75(Na(H)ClO4), CFe(III) = CFe(II) = 1-10-3 and CGly = 3·10-3 mol/l in the pH range 0.5-8.5 by the Clark-Nikolsky method. Therefore, we obtain an experimental curves of system EMF dependence on concentration parameters: pH, pCFe(III), pCFe(II), pCL. We also obtain the formation of the studied system coordination compounds of Fe(III) composition: [FeHL(H2O)5]3+, [Fe(HL)2(H2O)4]3+, [Fe2(HL)2(OH)2(H2O)8]4+, [FeIIIFeII(HL)2(OH)2(H2O)8]3+, as well as Fe(II): [Fe(HL)(H2O)5]2+, [Fe(HL)(OH)((H2O)]4+, [FeIIFeIII(HL)2(OH)2(H2O)8]3+. To calculate the constants of complex formation we used the method of successive approximation of the theoretical and experimental oxidation functions using the Excel program.

Keywords:
Fe(II), Fe(III), glycine, compounds, formation constant, ionic strength, oxidometric method, oxidation function
Text
Publication text (PDF): Read Download
References

1. Albert, A. & Sergent, E. (1964) Ionisation constants of acids and bases. M.: Khimiya (in Russian).

2. Yusupov, Z.N., Eshova, G.B. & Saidov, S.S. (2008) Effect of ionic strength on the values of the ionization constant of aminoethanoic acid, Doklady AN Respubliki Tadzhikistan, 51(8), pp. 620-625 (in Russian).

3. Kviatkovskaya, L.V., Eshova, G.B., Rakhimova, M.M. & Davlatshoeva J.A. (2014) Study of complexation in system iron(II) - glycine - water at ionic force of 1.0 mol/l, Vestnik TNU. Seriya estestvennyh nauk, (1-4), pp. 86 95 (in Russian).

4. Rakhimova, M. (2013) Complexation of Fe, Co, Mn and Cu ions with single- and multibasic organic acids, neutral ligands in aqueous solutions. PhD. Dushanbe (in Russian).

5. Yakubov, H.M., Shcherbakova, V.I., Palchevsky, V.V. & Bukharizoda, R.A. (1975) Glycinate iron complexes, Doklady Akademii nauk Tadzhikskoj SSR, XVIII(4), pp. 36-38 (in Russian).

6. Nikolsky, B.P., Palchevsky, V.V., Pendin, A.A. & Yakubov, H.M. (1975) Oxredmetry. L.: Khimiya (in Russian).

7. Zakharievsky, M.S. (1967) Oxredmetry. L.: Khimiya (in Russian).

8. Yakubov, H.M. (1966) Application of oxredmetry to the study of complexation. Dushanbe: Donish (in Russian).

9. Przybyl, R. (1960) Komplexons in chemical analysis. M.: Izd-vo inostr. literatury, pp. 383-386 (in Russian).

10. Zavorotny, V.L. & Kalacheva, N.A. (2007) Methodological guide to laboratory work in analytical chemistry. Titrimetric analysis. M.: RGU nefti i gaza im. I.M. Gubkina (in Russian).

11. Schumacher, I. (1963) Perchlorates: properties, production and applications. M.: HNTIKHL (in Russian).

12. Suslennikova, V.M. & Kiseleva, E.K. (1968) Manual on preparation of titrated solutions. L.: Khimiya, pp. 45 71 (in Russian).

13. Korostelev, P.P. (1962) Preparation of solutions for chemical and analytical studies. M.: AN USSR (in Russian).

14. Mishchenko, K.P. & Ravdelia, A.A. eds. (1974) Brief reference book of physico-chemical values. L.: Khimiya (in Russian).

15. Yasakau, K.A., Ferreira, M.G.S., Maltseva, A., Volovitch, P., Lamaka, S.V., Mei, D., Zheludkevich, M.L. & Orvi, H. (2022) The effect of carboxylate compounds on Volta potential and corrosion inhibition of Mg containing different levels of iron, Corrosion Science, 194, pp. 109937. DOI:https://doi.org/10.1016/j.corsci.2021.109937.

16. Rakhimova, M.M., Nurmatov, T.M., Yusupov, N.Z., Ismailova, M.A. & Faizullaev, E. (2013) Iron complexes with monocarboxylate anions: models of their formation, Russ. J. Inorg. Chem., 58(6), pp. 719-723. DOI:https://doi.org/10.7868/S0044457X13060214.

17. Rakhimova, M., Faizulloev, E., Mametova, A., Gafforova, H., Askalieva, N., Dzhumanazarova, A., Zhakypova, G. & Abdullaeva, Z. (2020) Complex formation in the Fe (II)-Fe (III)-acrylamide–water system and chemical models, J. Coord. Chem., 73(7), pp. 1077-1085. DOI:https://doi.org/10.1080/00958972.2020.1766682.

Login or Create
* Forgot password?