The minimum polarizability principle for spin states

The principle of minimum polarizability (MPP) has been investigated for the spin states of several transition metal complexes, using methods (OPBE, SSB-D) that are reliable for providing spin-state energies. For all complexes studied, these functionals indeed provide the same ground-state with similar spin-state splittings. The corresponding polarizabilities for each of the spin states however show that there is no correlation between the spin-state energy and its polarizability. Hence, the stability of a given spin-state can not be deduced from its polarizability value, leading to yet another breakdown of the MPP principle.