An investigation of the coordination chemistry of the hexadentate ligand di-2-pyridylketone azine; the formation of a discrete tetranuclear complex with silver nitrate
The ligand di-2-pyridylketone azine (1) was prepared by reaction of di-2-pyridylketone with hydrazine hydrate. This potentially hexadentate compound incorporates two extra imine donor atoms over other, previously investigated, ligands derived from di-2-pyridylmethane. The coordination chemistry of 1 was investigated with silver nitrate, copper nitrate and palladium chloride. Reaction of 1 with silver nitrate gave a discrete tetranuclear complex (4), while with copper nitrate decomposition of the original ligand gave copper complexes, (5) and (6), of the ligands 3-(2-pyridyl)-triazolo[1,5-a]pyridine (2) and di-2-pyridylmethanediol (3), respectively. The complexes were characterised by elemental analyses and X-ray crystallography.