Complexes of transition metals with oxygen donor ligands. Part I. Electronic and infrared spectra of some complexes of 2,6-dimethyl-4-pyrone

Abstract

The structures of a series of complexes of 2,6-dimethyl-4-pyrone with cobalt(II), nickel(II), copper(II), zinc(II), and chromium(III) have been elucidated from their electronic and far-i.r. spectra, and magnetic and conductivity measurements. Metal–halogen stretching frequencies are assigned for the metal halide complexes. In all cases the 2,6-dimethyl-4-pyrone is co-ordinated through the carbonyl oxygen, and tentative assignments are made for the metal–ligand stretching vibrations. The Dq-value for the ligand in the nickel(II) perchlorate complex indicates that the metal–ligand bonds are slightly stronger than metal–pyridine N-oxide bonds.