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Ferromagnetic Coupling through Spin Polarization in the Hexanuclear [MnII3CuII3] Complex

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posted on 23.08.2004, 00:00 by Mirela Pascu, Francesc Lloret, Narcis Avarvari, Miguel Julve, Marius Andruh
A novel Cu(II)−Mn(II) hexanuclear complex of formula [{MnCuL}3(tma)](ClO4)3·8H2O [H2L = macrocyclic Robson proligand; H3tma = trimesic acid] has been obtained by connecting three heterobinuclear [CuIIMnIIL]2+ cationic species through the trimesate anion. The complex exhibits a C3 rotational symmetry, imposed by the geometry of the bridging ligand. The interaction within each Mn(II)−Cu(II) pair is antiferromagnetic (J = −16.7 cm-1). A weak ferromagnetic coupling among the three S = 2 resulting spins through the tricarboxylato bridge leads to a S = 6 ground spin state, for which the spin polarization mechanism is responsible.