Palladium(ii) mixed-ligand complexes containing 2,2′-bipyridine derivatives and 4-toluenesulfonyl-l-serine: synthesis, characterization, and crystal structure determination.

The 4-toluenesulfonyl-L-serine ligand (1), (tsserH2), was prepared from the reaction of L-serine and 4-toluenesulfonyl chloride in sodium hydroxide solution 1 M. The complexes [Pd(4,4′-dmbipy)(tsser)] (2) and [Pd(5,5′-dmbipy)(tsser)].0.5CH3CN (3) (4,4′-dmbipy is 4,4′-dimethyl-2,2′-bipyridine and 5,5′-dmbipy is 5,5′-dimethyl-2,2′-bipyridine) were also prepared from the reaction of PdCl2and 2,2′-bipyridine derivatives with 4-toluenesulfonyl-L-serine ligand in mixture of CH3CN/CH3OH (3:1) and in presence of sodium hydroxide solution 0.5 M. These compounds were characterized by elemental analysis, IR,1H NMR, and UV–Vis spectroscopy and their structures were studied by single-crystal X-ray diffraction method. The X-ray structure determinations show that in the both complexes, the PdIIatoms are four-coordinated in a distorted square-planar configuration by two N atoms from a bidentate bipyridine ligand and one N atom and one O atom from a bidentate tsser2-ligand. [ABSTRACT FROM AUTHOR]