X-Ray Photoelectron Spectra of Aryl-nickel Complexes

The nature of bondings in aryl-nickel complexes has been clarified by means of X-ray photoelectron spectroscopy (XPS). Pi bonding between nickel and aryl ligand seem to be of little importance. Ni–Cl bondings are of partially ionic character. A correlation between stereochemical structure and satellites has been discussed. It is suggested that the aryl-nickel complexes examined have diamagnetic square-planar structures. Measurements of solid-state susceptibilities support this view.