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. 2018 Aug 28;54(70):9730-9733.
doi: 10.1039/c8cc05029e.

Strong carbon cage influence on the single molecule magnetism in Dy-Sc nitride clusterfullerenes

Christin Schlesier  1 , Lukas Spree  1 , Aram Kostanyan  2 , Rasmus Westerström  2 , Ariane Brandenburg  1 , Anja U B Wolter  1 , Shangfeng Yang  3 , Thomas Greber  2 , Alexey A Popov  1
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Strong carbon cage influence on the single molecule magnetism in Dy-Sc nitride clusterfullerenes

Christin Schlesier et al. Chem Commun (Camb). .

Abstract

Magnetic properties of endohedral metallofullerenes with nitride clusters DySc2N and Dy2ScN and different carbon cages are studied by SQUID magnetometry. All molecules behave as single molecule magnets (SMMs) and exhibit magnetic hysteresis. It is found that the blocking temperature of magnetization and relaxation times strongly depend on the fullerene cage, with the C80-Ih isomer offering the best SMM properties.

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Conflict of interest statement

Conflicts of interest

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1
Molecular structures of Dy–Sc nitride clusterfullerenes studies in this work: (a) DySc2N@C68-D3(6140),the C3 axis of the cage is perpendicular to the paper plane; (b) Dy2ScN@C84-Cs(51365), the symmetry plane of the cage is parallel to the paper plane; (c) DySc2N@C80-D5h(6); (d) Dy2ScN@C80-D5h(6). Dy atoms are green, Sc atoms are magenta, N is blue, carbon cages are grey except for adjacent pentagon pairs shown in red. In (c) and (d), the plane of the cluster is parallel to one of the σh planes of the cage, whereas the C5 axis is oriented vertically and is in the plane of the paper. All structures are based on DFT calculations of Y–Sc analogues.
Fig. 2
Fig. 2
Low temperature magnetization of Dy–Sc nitride clusterfullerenes: (a) DySc2N@C68-D3; (b) DySc2N@C80-D5h; (c) comparison of magnetic hysteresis curves of DySc2N@C68, DySc2N@C80-D5h, and DySc2N@C80-Ih measured at 2 K in identical conditions; (d) Dy2ScN@C80-D5h; (e) Dy2ScN@C84-Cs; (f) comparison of magnetic hysteresis curves of Dy2ScN@C84, Dy2ScN@C80-D5h, and Dy2ScN@C80-Ih measured at 2 K in identical conditions. The insets in (a), (b), (d), and (e) show determination of the blocking temperature of magnetization TB from temperature dependence of magnetic susceptibility (FC – field cooled, ZFC – zero-field cooled). Magnetic field sweep rate is 2.9 mT s−1, temperature sweep rate is 5 K min−1.
Fig. 3
Fig. 3
Temperature dependence of the relaxation times of magnetization measured by DC magnetometry for (a) DySc2N-EMFs in the field of 0.2 T to avoid QTM, and (b) for Dy2ScN-EMFs in zero field. The lines are fits of the experimental data with the model discussed in the text.
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