Journal
INORGANIC CHEMISTRY
Volume 48, Issue 8, Pages 3467-3479Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic801630z
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Funding
- European Union
- Spanish Ministerio de Ciencia e Innovacion [CSD2007-00010, MAT2007-61584, CTQ-2005-09385, NAN2004 09270C03-03]
- Generalitat Valenciana
- Gobierno de Aragon [PMO 12]
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The first two families of polyoxometalate-based single-molecule magnets (SMMs) are reported here. Compounds of the general formula [Ln(W5O18)(2)](9-) (Ln(III) = Tb, Dy, Ho, and Er) and [Ln(SiW11O39)(2)](13-) (Ln(III) = Tb, Dy, Ho, Er, Tm, and Yb) have been magnetically characterized with static and dynamic measurements. Slow relaxation of the magnetization, typically associated with SMM-like behavior, was observed for [Ln(W5O18)(2)](9-) (Ln(III) = Ho and Er) and [Ln(SiW11O39)(2)](13-) (Ln(III) = Dy, Ho, Er, and Yb). Among them, only the [Er(W5O18)(2)](9-) derivative exhibited such a behavior above 2 K with an energy barrier for the reversal of the magnetization of 55 K. For a deep understanding of the appearance of slow relaxation of the magnetization in these types of mononuclear complexes, the ligand-field parameters and the splitting of the J ground-state multiplet of the lanthanide ions have been also estimated.
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