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Rational Design of a Lanthanide-Based Complex Featuring Different Single-Molecule Magnets

Abstract : The rational synthesis of the 2-\1-methylpyridine-N-oxide-4,5-[4,5-bis(propylthio)tetrathiafulvalenyl]-1H-benzimidazol-2-yl\pyridine ligand (L) is described. It led to the tetranuclear complex [Dy4 (tta)12 (L)2 ] (Dy-Dy2 -Dy) after coordination reaction with the precursor Dy(tta)3 ⋅2 H2 O (tta(-) =2-thenoyltrifluoroacetonate). The X-ray structure of Dy-Dy2 -Dy can be described as two terminal mononuclear units bridged by a central antiferromagnetically coupled dinuclear complex. The terminal N2 O6 and central O8 environments are described as distorted square antiprisms. The ac magnetism measurements revealed a strong out-of-phase signal of the magnetic susceptibility with two distinct sets of data. The high- and low-frequency components were attributed to the two terminal mononuclear single-molecule magnets (SMMs) and the central dinuclear SMM, respectively. A magnetic hysteresis loop was detected at very low temperature. From both structural and magnetic points of view, the tetranuclear SMM Dy-Dy2 -Dy is a self-assembly of two known mononuclear SMMs bridged by a known dinuclear SMM
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Contributor : Laurent Jonchère <>
Submitted on : Friday, October 16, 2015 - 9:19:03 AM
Last modification on : Wednesday, January 13, 2021 - 9:41:13 AM

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Fabrice Pointillart, T. Guizouarn, B. Lefeuvre, S. Golhen, O. Cador, et al.. Rational Design of a Lanthanide-Based Complex Featuring Different Single-Molecule Magnets. Chemistry - A European Journal, Wiley-VCH Verlag, 2015, 21 (47), pp.16929-16934. ⟨10.1002/chem.201502416⟩. ⟨hal-01216292⟩



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