Chelating behaviour of methyl 2-pyridyl ketone carbono- and thiocarbonohydrazones in copper(II) and zinc(II) complexes

Abstract

The compounds bis(methyl 2-pyridyl ketone) carbono-(H₂L¹) and thiocarbono-hydrazone (H₂L²) have been synthesized, their protonation constants obtained through spectrophotometric studies and their crystal structures determined by X-ray diffractometry. Their complexation behaviour has been studied towards copper and zinc chloride and acetate. The results indicate that they are able to form bimetallic complexes with both copper salts used and zinc acetate; this is confirmed by an X-ray analysis carried out on [Cu₂(HL¹)Cl₃(OH₂)]·1.5H₂O.