An investigation of the coordination chemistry of the hexadentate ligand di-2-pyridylketone azine; the formation of a discrete tetranuclear complex with silver nitrate

Abstract

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.