Relaxation effects during core ionization in metal—metal-bonded complexes

Using the ligand group shift model to calculate metal binding energies (BE's), comparisons of BE(calc) and BE(obs) values reveal a correlation between relaxation energy and the extent of metal—metal bonding. No significant difference in relaxation energy is detected between monometal complexes and the dipalladium complexes which contain a single MM bond. However, substantially larger relaxation energies (1–2 eV) relative to monometal complexes are found for multiply MM-bonded complexes. The magnitude of the additional relaxation energy is in the range expected on the basis of comparisons with other systems.