Gold(III) Chlorohydroxo Complexes in Aqueous Solutions at Increased Temperatures

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Abstract

The stagewise substitution equilibria AuCl- 4 + iOH = AuCl4 – i OHi - + iCl, βi in aqueous solutions at 50 and 80°C (I = 1 mol/L NaCl) have been studied. The equilibrium constants log β1 = 7.26, log β2 = 13.98, log β3 = 19.66, log β4 = 24.78 (50°C); log β1 = 6.89, log β2 = 13.13, log β3 = 18.43, and log β4 = 23.30 (80°C) have been determined. They are lower than the same constants at 25°C. The spectra of complex speciesspecies at 80°C have been calculated, and the heterogeneous equilibrium 0.5Au2O3 xH2OS + OH = Au(OH)4 - + 0.5xH2O of the red Au2O3 · xH2OS species at 80°C has been studied, logKS = 3.7 ± 0.2. The obtained results may be useful in geochemistry and the synthesis of gold nanoparticles.

Original languageEnglish
Pages (from-to)420-425
Number of pages6
JournalRussian Journal of Inorganic Chemistry
Volume65
Issue number3
DOIs
Publication statusPublished - Mar 2020

Keywords

  • equilibria in solution
  • gold(III) complexes
  • increased temperatures
  • stability constants
  • substitution of ligands
  • GOLD NANOPARTICLES
  • REDUCTION
  • MECHANISM
  • SPECIATION
  • CITRATE
  • SIZE
  • PH

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