Application of Capillary Electrophoresis to the Study of Equilibria on an Example of Gold(III) Complexes

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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 = + Auam2 3+ + 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.

Original languageEnglish
Pages (from-to)586-592
Number of pages7
JournalJournal of Analytical Chemistry
Volume73
Issue number6
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • 1,3-diaminopropane
  • capillary electrophoresis
  • gold(III) complexes
  • KINETICS
  • METAL-COMPLEXES

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