Field Induced 4f5d [Re(salen)]2O3[Dy(hfac)3(H2O)]2 Single Molecule Magnet - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2010

Field Induced 4f5d [Re(salen)]2O3[Dy(hfac)3(H2O)]2 Single Molecule Magnet

Résumé

The reaction between the mononuclear [ReO(salen)(OMe)] (salen2- = N,N0-ethan-1,2-diylbis(salicylidenamine) dianion) and Dy(hfac)3 3 2H2O (hfac-= 1,1,1,5,5,5-hexafluoroacetylacetonate anion) complexes lead to the formation of a compound with the formula {[Re(salen)]2O3[Dy(hfac)3(H2O)]2}(CHCl3)2(CH2Cl2)2 noted (Dy2Re2). This compound has been characterized by single crystal and powder X-ray diffraction and has been found isostructural to the Y(III) derivative (Y2Re2) that we previously reported. The cyclic voltammetry demonstrates the redox activity of the system. The characterization of both static and dynamic magnetic properties is reported. Static magnetic data has been analyzed after the cancellation of the crystal field contribution by two different methods.Weak ferromagnetic exchange interactions between the Dy(III) ions are highlighted. The compound Dy2Re2 displays slow relaxation of the magnetization when an external magnetic field is applied. Alternating current susceptibility shows a thermally activated behavior with pre-exponential factors of 7.13 ((0.10) 10-6 and 5.76 ((0.27) 10-7 s, and energy barriers of 4.19 ((0.02) and 8.52 ((0.55) K respectively for low and high temperature regimes.
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hal-00495870 , version 1 (29-06-2010)

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Fabrice Pointillart, Kevin Bernot, R. Sessoli, D. Gatteschi. Field Induced 4f5d [Re(salen)]2O3[Dy(hfac)3(H2O)]2 Single Molecule Magnet. Inorganic Chemistry, 2010, 49, pp.4355-4361. ⟨10.1021/ic1003287⟩. ⟨hal-00495870⟩
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