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Article Dans Une Revue Inorganic Chemistry Année : 2014

Molecular magnets based on homometallic hexanuclear lanthanide(III) complexes

Résumé

The reaction of lanthanide(III) chloride salts (Gd(III), Dy(III), Tb(III), and Ho(III)) with the hetero donor chelating ligand N?-(2-hydroxy-3-methoxybenzylidene)-6-(hydroxymethyl)picolinohydrazide (LH3) in the presence of triethylamine afforded the hexanuclear Ln(III) complexes [Ln6(L)2(LH)2(?3-OH)4][MeOH]p[H2O]q[Cl]4·xH2O·yCH3OH (1, Ln = Gd(III), p = 4, q = 4, x = 8, y = 2; 2, Ln = Dy(III), p = 2, q = 6, x = 8, y = 4; 3, Ln = Tb(III), p = 2, q = 6, x = 10, y = 4; 4, Ln = Ho(III), p = 2, q = 6, x = 10, y = 2). X-ray diffraction studies revealed that these compounds possess a hexanuclear [Ln6(OH)4]14+ core consisting of four fused [Ln3(OH)]8+ subunits. Both static (dc) and dynamic (ac) magnetic properties of 1?4 have been studied. Single-molecule magnetic behavior has been observed in compound 2 with an effective energy barrier and relaxation time pre-exponential parameters of ?/kB = 46.2 K and τ0 = 2.85 ? 10?7 s, respectively.
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Dates et versions

hal-02007950 , version 1 (05-02-2019)

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S. Das, S. Hossain, A. Dey, S. Biswas, J.-P. Sutter, et al.. Molecular magnets based on homometallic hexanuclear lanthanide(III) complexes. Inorganic Chemistry, 2014, 53 (10), pp.5020-5028. ⟨10.1021/ic500052v⟩. ⟨hal-02007950⟩
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