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A Luminescent and Sublimable Dy III ‐Based Single‐Molecule Magnet
Author(s) -
Yi Xiaohui,
Bernot Kevin,
Pointillart Fabrice,
Poneti Giordano,
Calvez Guillaume,
Daiguebonne Carole,
Guillou Olivier,
Sessoli Roberta
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201201167
Subject(s) - isostructural , luminescence , quantum yield , antiferromagnetism , single molecule magnet , magnetization , molecule , derivative (finance) , crystallography , relaxation (psychology) , materials science , quantum tunnelling , chemistry , fluorescence , condensed matter physics , crystal structure , physics , optics , optoelectronics , magnetic field , psychology , social psychology , organic chemistry , quantum mechanics , financial economics , economics
The reaction of [Ln(hfac) 3 ] ⋅ 2 H 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.