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artículo con referato
"Structural and magnetic properties of Ln(III) complexes with diimines and crotonato as a bridging ligand"
A.M. Atria, R. Baggio, M.T. Garland, J.C. Muñoz and O. Peña
Inorg. Chim. Acta 357(7) (2004) 1997-2006
Five new lanthanide complexes displaying crotonato bridges have been prepared: [Gd2(crot)6(H2O)4] · 4(bpa) (1); [Ho2(crot)7]n · (Hbpa) (2); [Gd2(crot)6(bipy)2] (3); [Ho2(crot)6(bipy)2] (4) and [Nd2(crot)6(H2O)3]n (5), where bipy=2,2′bipyridine; bpa=di(2-pyridyl)amine; crot=crotonato. The compounds were characterized by magnetic susceptibility measurements and their crystal structures were determined by single crystal X-ray diffraction. These studies showed complexes 1, 3 and 4 to be dimers while structures 2 and 5 are polymeric in nature. Five lanthanide complexes displaying crotonates bridges were synthetized in the presence of aromatic diimines. The resulting compounds [Gd2(crot)6(H2O)4] · 4(bpa); [Ho2(crot)7]n · (Hbpa); [Gd2(crot)6(bipy)2]; [Ho2(crot)6(bipy)2] and [Nd2(crot)6(H2O)3]n; were characterized by magnetism and their crystal structure were determined by single crystal X-ray diffraction. The roll of the diimine is different in all of the complexes; sometimes being coordinated, uncoordinated or as external crystallization agent.
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