Synthesis and characterization of novel pyridine–isourea complexes of Pd(II)

Abstract

New neutral palladium(II) complexes having formula PdCl2(pyiuPr), PdCl2(pyiuCy), Pd(OCOCH3)2(pyiuPr), Pd(OCOCH3)2(pyiuCy), Pd(CH3)Cl(pyiuPr) and Pd(CH3)2(pyiuPr), where pyiuPr and pyiuCy are the novel ligands 1,3-diisopropyl-2-((pyridin-2-yl)methyl)isourea and 1,3-dicyclohexyl-2-((pyridin-2-yl)methyl)isourea, were synthesized and characterized. These neutral ligands act as bidentate and coordinate the palladium center through the pyridine N-atom and one of the nitrogen atoms of the isourea dent, as deducted by variable-temperature NMR experiments and DFT calculations and observed by X-ray diffraction experiments on the complex PdCl2(pyiuCy).