Macrocyclic {3d-4f} SMMs as building blocks for 1D-polymers: selective bridging of 4f ions by use of an O-donor ligand

Crystallisation of the tetranuclear 3d-4f Single-Molecule Magnet (SMM) [(Cu3TbIII)-Tb-II(L-Et)(NO3)(3)(MeOH)]center dot MeOH (1) with Na-2[tpa] (tpa = terephthalate and H6LEt is the [3 + 3] imine macrocycle derived from 1,4-diformyl-2,3-dihydroxybenzene and 1,2-diaminoethane) gives a structurally characterised one-dimensional cationic polymer {[(Cu3TbIII)-Tb-II(L-Et)(tpa)(H2O)(3)](NO3)center dot 0.5H(2)O center dot 0.25MeOH}(n) (2). A comparative study of the static and dynamic magnetic properties of 2 and its precursor, 1, is reported.