By analyzing the balance between the coordination bond and van der Waals energies of several U complexes, the coordination bond energy and the max. van der Waals attractive energy between the coordination atoms were found nearly identical. This is strong support for the packing model, and can be the foundation for the future development of that model.

Key words: CRYSTAL STRUCTURE DETERMINATION, CHEMICAL BONDS, OXALATO COMPLEX, COORDINATE CHEMISTRY, BOND ENERGY, ACTINIDE COMPLEX, VAN DER WAALS BONDS, URAN OXALATE