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Article Dans Une Revue Chemistry - A European Journal Année : 2012

A luminescent and sublimable Dy(III)-based single-molecule magnet.

Résumé

The reaction of [Ln(hfac)(3)]*2H(2)O and pyridine-N-oxide (PyNO) leads to isostructural dimers of the formula [Ln(hfac)(3)(PyNO)](2) (Ln=Eu, Gd, Tb, Dy). The Dy derivative shows a remarkable single-molecule magnet behavior with complex hysteresis at 1.4 K. The dynamics of the magnetization features are two relaxation regimes: a thermally activated one at high temperature (τ(0)=(5.62±0.4)×10(-11) s and Δ=(167±1) K) and a quantum tunneling regime at low temperature with a tunneling frequency of 0.42 Hz. The analysis of the Gd derivative evidences intradimer antiferromagnetic interactions (J=(-0.034±0.001) cm(-1)). Moreover, the Eu, Tb, and Dy derivatives are luminescent with quantum yield of 51, 53, and 0.1%, respectively. The thermal investigation of [Dy(hfac)(3)(PyNO)](2) shows that the dimers can be sublimated intact, suggesting their possible exploit as active materials for surface-confined nanostructures to be investigated by fluorimetry methods.

Dates et versions

hal-00771350 , version 1 (08-01-2013)

Identifiants

Citer

Xiaohui Yi, Kevin Bernot, Fabrice Pointillart, Giordano Poneti, Guillaume Calvez, et al.. A luminescent and sublimable Dy(III)-based single-molecule magnet.. Chemistry - A European Journal, 2012, 18 (36), pp.11379-87. ⟨10.1002/chem.201201167⟩. ⟨hal-00771350⟩
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