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Multiple Single-Molecule Magnet Behaviors in Dysprosium Dinuclear Complexes Involving a Multiple Functionalized Tetrathiafulvalene-Based Ligand.

Abstract : The reaction between the 2-(1-(2,6-di(pyrazol-1-yl)-4-methylpyridyl)-4,5-(4,5-bis(propylthio)-tetrathiafulvalenyl)-1H-benzimidazol-2-yl)-pyridine ligand (L) and 2 equiv of Dy(hfac)3·2H2O (hfac- = 1,1,1,5,5,5-hexafluoroacetylacetonate) and 1 equiv each of Dy(hfac)3·2H2O and Dy(tta)3·2H2O (tta- = 2-thenoyltrifluoroacetonate) metallic precursors leads to two dinuclear complexes, [Dy2(hfac)6(L)]·(CH2Cl2)2·C6H14 (1) and [Dy2(hfac)3(tta)3(L)] (2), respectively. Their X-ray structures reveal that the two coordination sites are occupied by one DyIII ion. The DyIII ion coordinated to the benzoimidazolylpyridine (bzip) moiety adopts a D4d coordination sphere, while the DyIII ion coordinated to the 2,6-di(pyrazol-1-yl)-4-pyridine (dpp) moiety is in a D3h surrounding. In a zero dc field, the dynamic magnetic measurements show a slow relaxation for the D4d eight-coordination DyIII magnetization for 1 and 2. Application of an external dc field induces multirelaxation signals of the magnetic susceptibility for both compounds. The low frequency and high frequency of the out-of-phase magnetic signals are attributed to the DyIII ion in D4d and D3h surroundings, respectively. The two complexes can be described as double induced-field mononuclear single-molecule magnets.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01139820
Contributor : Laurent Jonchère <>
Submitted on : Tuesday, April 7, 2015 - 10:23:02 AM
Last modification on : Thursday, March 5, 2020 - 2:06:57 PM

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Min Feng, Fabrice Pointillart, Bertrand Lefeuvre, Vincent Dorcet, Stéphane Golhen, et al.. Multiple Single-Molecule Magnet Behaviors in Dysprosium Dinuclear Complexes Involving a Multiple Functionalized Tetrathiafulvalene-Based Ligand.. Inorganic Chemistry, American Chemical Society, 2015, 54 (8), pp.4021-4028. ⟨10.1021/acs.inorgchem.5b00272⟩. ⟨hal-01139820⟩

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