Application of Capillary Electrophoresis to the Study of Equilibria on an Example of Gold(III) Complexes
- Authors: Mironov I.V.1,2, Kharlamova V.Y.1,2, Kokovkin V.V.1,2
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Affiliations:
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch
- Novosibirsk State University
- Issue: Vol 73, No 6 (2018)
- Pages: 586-592
- Section: Articles
- URL: https://journals.rcsi.science/1061-9348/article/view/183066
- DOI: https://doi.org/10.1134/S1061934818060084
- ID: 183066
Cite item
Abstract
Three systems of gold(III) complexes in an aqueous solution (I = 0.05 M, 25°C) with slow equilibration were studied by capillary electrophoresis. It was shown on an example of mixed chloride–hydroxide complexes Au(OH)iCl4-i- that, despite close sizes and identical charges of the forms, the mixed forms can be separated if they are kinetically inert. For the equilibria AuCl4−+ am = AuamCl2+ + 2Cl– and AuamCl2+ + am = + Auam23+ + 2Cl–, where am is ethylenediamine (en) and 1,3-diaminopropane (tn), the logarithmic constants were logK2 = 10.4 for en, and logK1 = 16.1 and logK2 = 12.0 for tn, which satisfactorily agrees with the spectrophotometric data. There was a considerable effect of side processes, insignificant under normal conditions.
About the authors
I. V. Mironov
Nikolaev Institute of Inorganic Chemistry, Siberian Branch; Novosibirsk State University
Author for correspondence.
Email: imir@niic.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
V. Yu. Kharlamova
Nikolaev Institute of Inorganic Chemistry, Siberian Branch; Novosibirsk State University
Email: imir@niic.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
V. V. Kokovkin
Nikolaev Institute of Inorganic Chemistry, Siberian Branch; Novosibirsk State University
Email: imir@niic.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090