Heterometallic Fe-2(II)-U-V and Ni-2(II)-U-V Exchange-Coupled Single-Molecule Magnets: Effect of the 3d Ion on the Magnetic Properties - Archive ouverte HAL
Journal Articles Chemistry - A European Journal Year : 2015

Heterometallic Fe-2(II)-U-V and Ni-2(II)-U-V Exchange-Coupled Single-Molecule Magnets: Effect of the 3d Ion on the Magnetic Properties

Abstract

Uranium-based compounds have been put forward as ideal candidates for the design of single-molecule magnets (SMMs) with improved properties, but to date, only two examples of exchange-coupled 3d-5f SMM containing uranium have been reported and both are based on the Mn-II ion. Here we have synthesized the first examples of exchange-coupled uranium SMMs based on Fe-II and Ni-II. The SMM behavior of these complexes containing a quasi linear M-O=U=O-M core arises from intramolecular Fe-U and Ni-U exchange interactions combined with the high Ising anisotropy of the uranyl(V) moiety. The measured values of the relaxation barrier (53.9 +/- 0.9 K in the UFe2 complex and of 27.4 +/- 0.5 K in the UNi2 complex) show clearly the dependency on the spin value of the transition metal, providing important new information for the future design of improved uranium-based SMMs.

Dates and versions

hal-01588165 , version 1 (15-09-2017)

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Cite

Lucile Chatelain, Jacques Pécaut, Floriana Tuna, Marinella Mazzanti. Heterometallic Fe-2(II)-U-V and Ni-2(II)-U-V Exchange-Coupled Single-Molecule Magnets: Effect of the 3d Ion on the Magnetic Properties. Chemistry - A European Journal, 2015, 21 (50), pp.18038-18042. ⟨10.1002/chem.201503637⟩. ⟨hal-01588165⟩
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