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

GRAPHICAL ABSTRACT

Abstract

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 PdCl₂ and 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 Pd^II atoms 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 tsser^2- ligand.

Keywords:

• Crystal structure
• palladium(II) complexes
• 4-toluenesulfonyl-L-serine
• 4,4′-dimethyl-2,2′-bipyridine
• 5,5′-dimethyl-2,2′-bipyridine