A Luminescent and Sublimable DyⅢ-based Single Molecule Magnet
The reaction of Ln(hfac)3·2H2O and pyridine-N-oxide leads to isostructural dimers of formula ”Ln(hfac)3(PyNO)”2 (with Ln =Eu, Gd, Tb, Dy).The Dy derivative shows a remarkable single-molecule magnet behaviour with complex hysteresis at 1.4 K.The dynamics of the magnetization features two relaxation regimes: a thermally activated one at high temperature (τ0=5.62 ± 0.4×10-11 s and △=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.
lanthanides magnetism single-molecule magnets luminescence thermal stability sublimation
Xiaohui Yi Kevin Bernot Fabrice Pointillart Giordano Poneti Guillaume Calvez Carole Daiguebonne Olivier Guillou Roberta Sessoli
Université Européenne de Bretagne, France INSA, SCR, UMR 6226, F-35708 RENNES 20av.des buttes de Co( Sciences Chimiques de Rennes, UMR 6226 CNRS, Université de Rennes 1263 Avenue du Général Leclerc 350 Università degli Studi ”Guglielmo Marconi” Via Plinio 144, 00193 Rome, Italy University of Florence, ”Ugo Schiff” Chemistry Department & INSTM Research UnitVia della Lastruccia
国内会议
宁波
英文
1272-1300
2014-11-11（万方平台首次上网日期，不代表论文的发表时间）