Abstract

Lanthanoid complexes have become an important type of material since their interesting magnetic and optical properties. Single Ion Magnets based on lanthanoid systems correspond to the second generation of Single Molecular Magnets, which are coordination compounds that present slow relaxation of the magnetization at low temperature. This is due to anisotropy of the f orbitals that induces a magnetization energy barrier, magnetic hysteresis and quantum tunneling of magnetization (QTM). The used of rigid inorganic ligands such as lacunary polyoxometalates and organic ligands could permit the obtaining of complexes, in which the magnetic properties can be modify by the substitution of the organic ligands. In this work are presented a new type of lanthanoid complexes based in the inorganic ligand, [PW11O39]7- and an organic ligand (L), such as phenanthroline or bipyridine forming a hybrid inorganic-organic complex of formula, [(NBu4)3(H3O)][Ln(PW11O39)(L)2], where Ln = Dy3+, Er3+, Tb3+ or Ho3+.