K-Absorption spectral studies of some copper(II) mixed-ligand complexes

Edge shifts (Delta E), effective nuclear charge (Z(eff)) and % covalency fo r some copper(II) mixed-ligand complexes were determined by investigating t he copper K-absorption edge using a Seifert x-ray generator and a 0.4 m Cau chois-type bent crystal transmission spectrograph. The shift values are sug gestive of a parabolic dependence on Z(eff) of copper. Using the method of least squares, an expression Delta E = a + b(Z(eff)) + c(Z(eff))(2) was fou nd to hold good for the dependence of Delta E on Z(eff) in the case of the complexes studied. Copyright (C) 2000 John Wiley & Sons, Ltd.