The use of lanthanoid atoms as central metal ions in inorganic complexes seems to be the most promising way to achieve Single Molecule Magnets (SMM) with high operational temperatures . This promise comes from the characteristic electronic structure properties of the lanthanide complexes, which involve only a weak mixing of the valence f -orbitals with the ligand. The valence space of these systems is more akin to atomic 4 forbitals, and like their atomic counterparts, the electronic structure of these complexes is dominated by spin-orbit J-multiplets, that are only weakly split by electronic interaction with the ligand field . As a consequence, lanthanide based SMMs feature a large magnetic anisotropy arising from the crystal field splitting of the large unquenched angular momentum states in the ground multiplet.