Dushanbe, Tajikistan
Dushanbe, Tajikistan
Dushanbe, Tajikistan
UDK 546.593 Трехвалентное золото
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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