Heterometallic Fe2 (II) -U(V) and Ni2 (II) -U(V) Exchange-Coupled Single-Molecule Magnets: Effect of the 3 d Ion on the Magnetic Properties.
Chemistry
; 21(50): 18038-42, 2015 Dec 07.
Article
en En
| MEDLINE
| ID: mdl-26464190
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±0.9â
K in the UFe2 complex and of 27.4±0.5â
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.
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2015
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