Душанбе, Таджикистан
Россия
Душанбе, Таджикистан
Душанбе, Таджикистан
УДК 544.342 Равновесие в гомогенных системах. Гомогенное равновесие
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.
Fe(II), Fe(III), glycine, compounds, formation constant, ionic strength, oxidometric method, oxidation function
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.
