Application of the angular overlap model to the interpretation of the electronic spectra of some copper(II) and nickel(II) acetylacetonate complexes
Abstract
The angular overlap model has been used to calculate σ- and π;-bonding parameters for three copper complexes and one nickel complex of the type M(acac)2(acac = the acetylacetonate anion or a closely related ligand). The results suggest that the orbital energy sequence in the copper complexes is probably dxydz2 > dx2–y2 > dxz∼dyz, but that in the nickel complex the stronger metal-ligand interaction causes the sequence dxy
dx2–y2 > dz2 > dxz∼dyz. The parameters estimated for the diamagnetic nickel complex can successfully be used to predict the d-orbital splittings observed for three paramagnetic nickel acetylacetonate complexes.