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A uranium-based UO2(+)-Mn2+ single-chain magnet assembled trough cation-cation interactions.

Mougel V, Chatelain L, Hermle J, Caciuffo R, Colineau E, Tuna F, Magnani N, de Geyer A, Pécaut J, Mazzanti M - Angew. Chem. Int. Ed. Engl. (2013)

Bottom Line: The 5f-3d heterometallic 1D chains [{[UO2(salen)(py)][M(py)4](NO3)}]n, (M=Cd (1) and M=Mn (2); py=pyridine) are assembled trough cation-cation interaction from the reaction of the uranyl(V) complex [UO2(salen)py][Cp*2Co] (Cp*=pentamethylcyclopentadienyl) with Cd(NO3)2 or Mn(NO3)2 in pyridine.The infinite UMn chain displays a high relaxation barrier of 134±0.8 K (93±0.5 cm(-1)), probably as a result of strong intra-chain magnetic interactions combined with the high Ising anisotropy of the uranyl(V) dioxo group.It also exhibits an open magnetic hysteresis loop at T<6 K, with an impressive coercive field of 3.4 T at 2 K.

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Affiliation: Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIB, UMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France) http://inac.cea.fr/Pisp/51/marinella.mazzanti.html.

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Field dependence of the magnetization of 2 measured at 2.5 K. Inset shows hysteresis loops recorded at four different temperatures.
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fig03: Field dependence of the magnetization of 2 measured at 2.5 K. Inset shows hysteresis loops recorded at four different temperatures.

Mentions: The existence of a magnetic ground state in 2 is further confirmed by the observation of magnetic hysteresis loops. As shown in Figure 3, magnetic bistability is observed in all magnetization versus field scans at 2–5 K. With decreasing temperature, the coercive field increases, reaching a value of 3.4 T at 2 K. At zero field, a remanent magnetization (REM) of 1.7 μB is preserved. This behavior is typical of a single-chain magnet below its blocking temperature (TB). Indeed, below 6 K a divergence is observed between zero-field-cooled and field-cooled magnetizations as a function of temperature (see the Supporting Information). In addition, REM vanishes at ca. 5.8 K, which corresponds to the blocking temperature of the material.


A uranium-based UO2(+)-Mn2+ single-chain magnet assembled trough cation-cation interactions.

Mougel V, Chatelain L, Hermle J, Caciuffo R, Colineau E, Tuna F, Magnani N, de Geyer A, Pécaut J, Mazzanti M - Angew. Chem. Int. Ed. Engl. (2013)

Field dependence of the magnetization of 2 measured at 2.5 K. Inset shows hysteresis loops recorded at four different temperatures.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4232274&req=5

fig03: Field dependence of the magnetization of 2 measured at 2.5 K. Inset shows hysteresis loops recorded at four different temperatures.
Mentions: The existence of a magnetic ground state in 2 is further confirmed by the observation of magnetic hysteresis loops. As shown in Figure 3, magnetic bistability is observed in all magnetization versus field scans at 2–5 K. With decreasing temperature, the coercive field increases, reaching a value of 3.4 T at 2 K. At zero field, a remanent magnetization (REM) of 1.7 μB is preserved. This behavior is typical of a single-chain magnet below its blocking temperature (TB). Indeed, below 6 K a divergence is observed between zero-field-cooled and field-cooled magnetizations as a function of temperature (see the Supporting Information). In addition, REM vanishes at ca. 5.8 K, which corresponds to the blocking temperature of the material.

Bottom Line: The 5f-3d heterometallic 1D chains [{[UO2(salen)(py)][M(py)4](NO3)}]n, (M=Cd (1) and M=Mn (2); py=pyridine) are assembled trough cation-cation interaction from the reaction of the uranyl(V) complex [UO2(salen)py][Cp*2Co] (Cp*=pentamethylcyclopentadienyl) with Cd(NO3)2 or Mn(NO3)2 in pyridine.The infinite UMn chain displays a high relaxation barrier of 134±0.8 K (93±0.5 cm(-1)), probably as a result of strong intra-chain magnetic interactions combined with the high Ising anisotropy of the uranyl(V) dioxo group.It also exhibits an open magnetic hysteresis loop at T<6 K, with an impressive coercive field of 3.4 T at 2 K.

View Article: PubMed Central - PubMed

Affiliation: Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIB, UMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France) http://inac.cea.fr/Pisp/51/marinella.mazzanti.html.

No MeSH data available.


Related in: MedlinePlus