Palladium Complexes of Pyrimidine-2-thiones: Synthesis, Structures, and Properties

Abstract

Complexes [PdL₂Cl₂] (I) and [PdL₂Вr₂] (II) (L is 5-acetyl-6-methyl-4-(3-nitrophenyl)-1,2,3,4-tetrahydropyrimidine-2-thione) are synthesized and characterized by spectral methods (¹Н, ¹³С NMR and IR spectroscopy). The crystal structure of complex I is determined (CIF file ССDС no. 2233053) in which the palladium atom is coordinated by two halide ions and two sulfur atoms of two ligands L in a distorted square planar geometry. The catalytic activity of the synthesized palladium(II) complexes in the model epoxidation of allyl alcohol is estimated in comparison with the catalytic activity of the corresponding palladium halides and titanium-containing zeolite TS-1.