The reaction of [Ln(hfac)3]⋅2 H2O 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 (τ0=(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.

A Luminescent and Sublimable DyIII-Based Single-Molecule Magnet / Xiaohui Yi;Kevin Bernot;Fabrice Pointillart;Giordano Poneti;Guillaume Calvez;Carole Daiguebonne;Olivier Guillou;Roberta Sessoli. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - STAMPA. - 18:(2012), pp. 11379-11387. [10.1002/chem.201201167]

A Luminescent and Sublimable DyIII-Based Single-Molecule Magnet

PONETI, GIORDANO;SESSOLI, ROBERTA
2012

Abstract

The reaction of [Ln(hfac)3]⋅2 H2O 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 (τ0=(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.
18
11379
11387
Xiaohui Yi;Kevin Bernot;Fabrice Pointillart;Giordano Poneti;Guillaume Calvez;Carole Daiguebonne;Olivier Guillou;Roberta Sessoli
File in questo prodotto:
File Dimensione Formato  
CAEJ_2012.pdf

Accesso chiuso

Tipologia: Versione finale referata (Postprint, Accepted manuscript)
Licenza: DRM non definito
Dimensione 1.03 MB
Formato Adobe PDF
1.03 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/771459
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 119
  • ???jsp.display-item.citation.isi??? 120
social impact