2N-(2-Mercaptophenyl)-1, 2, 3-benzothiadiazoline as a Specific Reagent for the Extraction-Spectrophotometric Determination of Palladium

Abstract

A new sulfur containing bidentate ligand 2N-(2-mercaptophenyl)-1, 2, 3-benzothiadiazoline (MBDT) was synthesized by the Sandmeyer/Azo coupling reaction. This reagent reacts selectively with palladium to form extractable complexes which are different from those complexes prepared by a direct addition of the reagent. The spectrum of the complex is red shifted from that of the free reagent. The extractability of the Pd-MBTD complex is affected in the presence of some anions, such as Br^-, l^- and SCN^-, but enhanced in presence of Cl^-. The dissociation constants and the distribution constants for the palladium ions with MBTD were evaluated.