Spectrophotometric investigations of the reaction between gold(III) and potassium iodide

Abstract

The equilibria of the complex formation between AuCl4-n(OH)n - and I- was studied spectrophotometrically in aqueous solutions containing KI:Au(III)£2 in the acidity range from 1 M HCl to pH 7 at 25ºC. From the hydrogen ion and Cl-ion dependence of the absorption spectra, it was found that AuCl2I2 - and Au(OH)2I2 - complexes were formed. The equilibrium constants of complex formation were determined.

Keywords

• au(iii)
• iodine
• complexes
• aqueous solutions