A cyclic tetranuclear Cu2Gd2 complex with an S=8 ground state derived from ferromagnetic spin-coupling between copper(II) and gadolinium(III) ions arrayed alternately

A cyclic tetranuclear (Cu2Gd2III)-Gd-II complex, in which Cu-II and Gd-III ions are arrayed alternately, has an S = 8 spin ground state, due to the ferromagnetic spin coupling between S-Gd = 7/2 and S-Cu = 1/2.