Diisopentyl Sulphide as an Extractant for Palladium(II) and the Crystal Structure of Palladium(II) Complex

Abstract

Diisopentyl sulphide (DIS) was used in an extractant for Pd(II) from hydrochloric acid media. Palladium(II) was extracted quantitatively from 0.1 M HCl with diisopentyl sulphide in kerosene. Ammonia solution could be used as stripping agent. Extraction parameters of Pd(II), including diisopentyl sulphide concentration, contact time of aqueous and organic phases, organic/aqueous (O/A) phase ratio, ammonia concentration and hydrochloric acid concentration of aqueous phase, were studied. Diisopentyl sulphide and Pd(II) form a 2:1 adduct Pd(DIS)₂Cl₂ in the extraction. X-Ray crystal structure determination revealed that Pd(DIS)₂Cl₂ is square-planar complex in which diisopentyl sulphide acts as a neutral unidentate ligand coordinated with palladium(II) via the sulphur atom of the diisopentyl sulphide.