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A Diferrous Single-Molecule Magnet
European Journal of Inorganic Chemistry, 2007-06, Vol.2007 (17), p.2409-2415
Boudalis, Athanassios K.
Sanakis, Yiannis
Clemente-Juan, Juan Modesto
Mari, Alain
Tuchagues, Jean-Pierre
2007
Details
Autor(en) / Beteiligte
Boudalis, Athanassios K.
Sanakis, Yiannis
Clemente-Juan, Juan Modesto
Mari, Alain
Tuchagues, Jean-Pierre
Titel
A Diferrous Single-Molecule Magnet
Ist Teil von
European Journal of Inorganic Chemistry, 2007-06, Vol.2007 (17), p.2409-2415
Ort / Verlag
Weinheim: WILEY-VCH Verlag
Erscheinungsjahr
2007
Link zum Volltext
Quelle
Wiley-Blackwell Full Collection
Beschreibungen/Notizen
The diferrous complex [Fe2(acpypentO)(NCO)3] (1),(acpypentO– = the anion of 1,5‐bis[2‐pyridyl(1‐ethylimino)]pentane‐3‐ol) was studied by spectroscopic (dual‐mode X‐band EPR and 57Fe‐Mössbauer) and magnetic (AC magnetic susceptibility) techniques. Complex 1 (A. K. Boudalis et al., Inorg. Chem. 2004, 43, 1574) was previously shown to exhibit an intramolecular ferromagnetic coupling with important single‐ion anisotropies with marked differences in the single‐ion electronic parameters of the two iron sites. In this contribution, additional studies are carried out to probe its dynamic magnetic properties. Mössbauer spectra recorded at liquid helium temperatures indicate slow paramagnetic relaxation and a ground state of the system characterized by a non‐Kramers doublet with an Ising‐type anisotropy, a condition which favours single‐molecule magnet (SMM) behaviour. A frequency‐dependent out‐of‐phase signal observed below 3 K in AC susceptibility measurements is in line with such a picture. The out‐of‐phase signal, however, is relatively weak in comparison with the in‐phase signal. Dual mode X‐band EPR spectroscopy revealed characteristic signals, the analysis of which suggests inhomogeneities in the system. For some molecules, the splitting Δ0 of the non‐Kramers ground doublet is vanishingly small, which gives rise to out‐of‐phase signals in AC susceptibility measurements and magnetically split Mössbauer spectra in the absence of external magnetic fields. Other molecules, however, are characterized by a nonnegligible Δ0, which gives rise to the dual mode X‐band EPR signals. For these molecules the magnetic relaxation is fast. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Sprache
Englisch
Identifikatoren
ISSN: 1434-1948
eISSN: 1099-0682
DOI: 10.1002/ejic.200700203
Titel-ID: cdi_crossref_primary_10_1002_ejic_200700203
Format
–
Schlagworte
Cluster compounds
,
Iron
,
Magnetic properties
,
Single-molecule studies
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