Complexation of palladium(II) with chloride and hydroxide

Abstract

Complex formation of Pd(II) with chloride and hydroxide has been investigated by spectrophotometry at 25°C and ionic strength 1.0 M. For the chloride complexes [PdCl n (H2O)4− n ]2− n (n = 0–4), the formation constants, β n , have been determined and the values are: log β1 = 4.47, log β2 = 7.80, log β3 = 10.18 and log β4 = 11.53. The formation of mixed chloro-hydroxo complexes, [PdCl p (OH) q ]2−, has been investigated at three chloride concentrations, 1.0, 0.5 and 0.2 M over the pHc range 4–12. The average values determined for the formation constants, β pq , where p and q refer to the number of chloride and hydroxide ions in the complex, are: log β31 = 16.48, log β22 = 20.63, log β13 = 24.02 and log β04 = 26.23. Molar absorption spectra for all the complexes in question have been obtained.