From Chemistry Towards Technology Step-By-Step From Chemistry Towards Technology Step-By-Step От химии к технологии шаг за шагом 2782-1900 82273 10.52957/27821900_2022_03_116 Научные статьи Scientific articles Научные статьи Influence of temperature on the stability of 2-ethylimidazole Au (III) complexes Influence of temperature on the stability of 2-ethylimidazole Au (III) complexes Сафармамадзода Сафармамад Муборакшо Safarmamadzoda Safarmamad Muboraksho

доктор химических наук;

doctor of chemical sciences;

 Курбонбеков Джамолидин Сарадбекович Kurbonbekov Jamolidin Saradbekovich Мубораккадамов Даврон Ахмаджонович Muborakkadamov Davron Ahmadzhonovich

кандидат химических наук;

candidate of chemical sciences;

 Таджикский национальный университет Tajik National University 23 09 2022 23 09 2022 3 3 116 122 02 09 2022 19 09 2022 https://chemintech.ru/en/nauka/article/82273/view

This article deals with the complexation of gold (III) with 2-ethylimidazole at a temperature range of 278-328 K by potentiometric titration. The reduction of the Au/[AuCl4]- system potential during the titration process at all temperatures under study indicates a reduction of the equilibrium concentration of [AuCl4]- and their coupling into complexes. The non-linearity of the dependence of E on lgCL is characteristic for the systems in which stepwise complexation occurs. We calculated the common stability constants of the complexes [Au(2-EI)Cl3] and [Au(2-EI)2Cl2]Cl (at 298 K lgβ1 = 6.14±0.06; lgβ2 = 13.18±0.08). The stability of the complexes grows with increasing of temperature. The temperature factor affects the stability of the bisubstituted complex to a greater extent (at a rise in temperature by 50 °C the stability of the bisubstituted complex increases by 2.69 log units, at the same temperature interval the stability of the monosubstituted complex increases by 1.32 log units).

This article deals with the complexation of gold (III) with 2-ethylimidazole at a temperature range of 278-328 K by potentiometric titration. The reduction of the Au/[AuCl4]- system potential during the titration process at all temperatures under study indicates a reduction of the equilibrium concentration of [AuCl4]- and their coupling into complexes. The non-linearity of the dependence of E on lgCL is characteristic for the systems in which stepwise complexation occurs. We calculated the common stability constants of the complexes [Au(2-EI)Cl3] and [Au(2-EI)2Cl2]Cl (at 298 K lgβ1 = 6.14±0.06; lgβ2 = 13.18±0.08). The stability of the complexes grows with increasing of temperature. The temperature factor affects the stability of the bisubstituted complex to a greater extent (at a rise in temperature by 50 °C the stability of the bisubstituted complex increases by 2.69 log units, at the same temperature interval the stability of the monosubstituted complex increases by 1.32 log units).

 potentiometry step complexation gold (III) 2-ethylimidazole stability constant temperature factor

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