Journal
CRYSTENGCOMM
Volume 11, Issue 10, Pages 2078-2083Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b906539c
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Funding
- Centre Franco-Indien pour la Promotion de la Recherche Avancee/Indo-French Centre for the Promotion of Advanced Research [3108-3]
- European Union [NMP3-CT-2005-515767]
- DST, India [SR/S1/IC-08/2008]
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Heterometallic {3d-4f-5d} aggregates with formula [{(LNi)-Ni-Me2(H2O)Ln(H2O)4.5}(2){W(CN)(8)}(2)]center dot 15H(2)O, (L-Me2 stands for N,N'-2,2-dimethylpropylenedi(3-methoxysalicylideneiminato) Schiff-base ligand) with Ln = Gd, Tb, Dy, have been obtained by reacting bimetallic [(LNi)-Ni-Me2(H2O)(2)Ln(NO3)(3)] and Cs-3{W(CN)(8)} in H2O. The hexanuclear complexes are organized in 1-D arrays by means of hydrogen bonds established between the solvent molecules coordinated to Ln and the CN ligands of an octacyanometallate moiety. The X-ray structure was solved for the Tb derivative. Magnetic behavior indicates ferromagnetic {W-Ni} and {Ni-Ln} interactions (J(NiW) = 18.5 cm(-1), J(NiGd) = 1.85 cm(-1)) as well as ferromagnetic intermolecular interactions mediated by the H-bonds. Dynamic magnetic susceptibility studies reveal slow magnetic relaxation processes for the Tb and Dy derivatives, suggesting SMM type behavior for these compounds.
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