Abstract
A new iso-amyl benzothiazolyl sulfoxide (ABSO) was synthesized and used in the extraction of Pd(II) from hydrochloric acid media. Pd(II) was extracted quantitatively from 0.1 M HCl with ABSO in benzene (0.5 M). Ammonia solution (2.0 M) could be used as stripping agent. ABSO and Pd(II) form a 2:1 adduct [Pd (ABSO)2Cl2] in the extraction. X-ray crystal structure determination revealed PdCl2(ABSO)2 is a square-planar complex in which ABSO acts as a neutral unidentate ligand coordinated with palladium(II) via the thiazolyl N atom.
Highlights
Palladium is a good catalyst and is widely used in hydrogenation and dehydrogenation reactions
As Pd(II) can form a number of Molecules 2005, 10 complexes that are soluble in organic solvents [3], solvent extraction has become an effective technique in the recovery and separation of palladium from aqueous solutions [4,5,6,7]
The crystal structure of PdCl2(ABSO)2 showed that amyl benzothiazolyl sulfoxide (ABSO) acts as a neutral unidentate ligand coordinated with Pd(II) via the benzothiazolyl N atom; this is quite different from general Pd(II) dialkyl sulfoxide complexes in which sulfoxides are coordinated with palladium via the O or S atoms of the ligand [13,14,15,16]
Summary
Palladium is a good catalyst and is widely used in hydrogenation and dehydrogenation reactions. The crystal structure of PdCl2(ABSO)2 showed that ABSO acts as a neutral unidentate ligand coordinated with Pd(II) via the benzothiazolyl N atom; this is quite different from general Pd(II) dialkyl sulfoxide complexes in which sulfoxides are coordinated with palladium via the O or S atoms of the ligand [13,14,15,16]. Extractions were carried out by shaking equal volumes (10 mL) of the Pd(II) aqueous solution and ABSO dissolved in benzene with the extractant concentration varying from 5x10-2 ~ 1.0 M.
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