Effect of 3d-4f Magnetic Exchange Interactions on the Dynamics of the Magnetization of Dy lll-M ll- Dy lll Trinuclear Clusters - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Chemistry - A European Journal Année : 2007

Effect of 3d-4f Magnetic Exchange Interactions on the Dynamics of the Magnetization of Dy lll-M ll- Dy lll Trinuclear Clusters

Résumé

[{Dy(hfac)3}2{Fe(bpca)2}]CHCl3 ([Dy2Fe]) and [{Dy(hfac)3}2{Ni-(bpca)2}]*CHCl3 ([Dy2Ni]) (in which hfac=1,1,1,5,5,5-hexafluoroacetylacetonate and bpca=bis(2-pyridylcarbonyl) amine anion) were synthesized and characterized. Single-crystal X-ray diffraction shows that [Dy2Fe] and [Dy2Ni] are linear trinuclear complexes. Static magnetic susceptibility measurements reveal a weakferroma gnetic exchange interaction between NiII and DyIII ions in [Dy2Ni], whereas the use of the diamagnetic FeII ion leads to the absence of magnetic exchange interaction in [Dy2Fe]. Dynamic susceptibility measurements show a thermally activated behavior with the energy barrier of 9.7 and 4.9 K for the [Dy2Fe] and [Dy2Ni] complexes, respectively. A surprising negative effect of the ferromagnetic exchange interaction has been found and has been attributed to the structural conformation of these trinuclear complexes.

Dates et versions

hal-00525270 , version 1 (11-10-2010)

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Citer

Fabrice Pointillart, Kevin Bernot, Roberta Sessoli, Dante Gatteschi. Effect of 3d-4f Magnetic Exchange Interactions on the Dynamics of the Magnetization of Dy lll-M ll- Dy lll Trinuclear Clusters. Chemistry - A European Journal, 2007, 13, pp.1602-1609. ⟨10.1002/chem.200601194⟩. ⟨hal-00525270⟩
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