From Chemistry Towards Technology Step-By-Step From Chemistry Towards Technology Step-By-Step От химии к технологии шаг за шагом 2782-1900 81562 10.52957/27821900_2023_01_101 Научные статьи Scientific articles Научные статьи 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 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 https://orcid.org/0000-0002-1349-2476 Рахимова Мубаширхон Rakhimova Mubashirhon

доктор химических наук;

doctor of chemical sciences;

 https://orcid.org/0000-0002-1390-2949 Файзуллозода Эркин Фатхулло Faizullozoda Erkin Fathullo

кандидат химических наук;

candidate of chemical sciences;

 https://orcid.org/0000-0002-0277-3758 Давлатшоева Джахонгул Асанхоновна Davlatshoeva Jahongul Asanhonovna

кандидат химических наук;

candidate of chemical sciences;

 https://orcid.org/0000-0003-0329-2785 Эшова Гулрухсор Бобоназаровна Eshova Gulruhsor Bobonazarovna

кандидат химических наук;

candidate of chemical sciences;

 Таджикский национальный университет Tajik National University 23 03 2023 23 03 2023 4 1 101 106 28 12 2022 21 03 2023 https://chemintech.ru/en/nauka/article/81562/view

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.

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

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