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Yang et al 2019, Single Molecule Magnetism with Strong Magnetic Anisotropy and Enhanced.pdf | 2,35 MB | Adobe PDF | View/Open |
Title: | Single Molecule Magnetism with Strong Magnetic Anisotropy and Enhanced Dy∙∙∙Dy Coupling in Three Isomers of Dy-Oxide Clusterfullerene Dy2O@C82 |
Authors: | Yang, W.; Velkos, G.; Liu, F.; Sudarkova, S.M.; Wang, Y.; Zhuang, J.; Zhang, H.; Li, X.; Zhang, X.; Büchner, B.; Avdoshenko, S.M.; Popov, A.A.; Chen, N. |
Publishers Version: | https://doi.org/10.1002/advs.201901352 |
Issue Date: | 2019 |
Published in: | Advanced Science Vol. 6 (2019), No. 20 |
Publisher: | Chichester : John Wiley and Sons Ltd |
Abstract: | A new class of single-molecule magnets (SMMs) based on Dy-oxide clusterfullerenes is synthesized. Three isomers of Dy2O@C82 with Cs(6), C3v(8), and C2v(9) cage symmetries are characterized by single-crystal X-ray diffraction, which shows that the endohedral Dy−(µ2-O)−Dy cluster has bent shape with very short Dy−O bonds. Dy2O@C82 isomers show SMM behavior with broad magnetic hysteresis, but the temperature and magnetization relaxation depend strongly on the fullerene cage. The short Dy−O distances and the large negative charge of the oxide ion in Dy2O@C82 result in the very strong magnetic anisotropy of Dy ions. Their magnetic moments are aligned along the Dy−O bonds and are antiferromagnetically (AFM) coupled. At low temperatures, relaxation of magnetization in Dy2O@C82 proceeds via the ferromagnetically (FM)-coupled excited state, giving Arrhenius behavior with the effective barriers equal to the AFM-FM energy difference. The AFM-FM energy differences of 5.4–12.9 cm−1 in Dy2O@C82 are considerably larger than in SMMs with {Dy2O2} bridges, and the Dy∙∙∙Dy exchange coupling in Dy2O@C82 is the strongest among all dinuclear Dy SMMs with diamagnetic bridges. Dy-oxide clusterfullerenes provide a playground for the further tuning of molecular magnetism via variation of the size and shape of the fullerene cage. |
Keywords: | antiferromagnetic; dysprosium; exchange interactions; metallofullerene; oxide; single molecule magnets; Cages (mine hoists); Crystal symmetry; Dysprosium; Exchange interactions; Excited states; Frequency modulation; Fullerenes; Isomers; Magnetic anisotropy; Magnetic moments; Magnetization; Magnets; Molecules; Oxides; Single crystals; Synthesis (chemical); Antiferromagnetics; Arrhenius behaviors; Magnetization relaxation; Metallofullerenes; Molecular magnetism; Relaxation of magnetization; Single crystal x-ray diffraction; Single-molecule magnet; Dysprosium compounds |
DDC: | 530 |
License: | CC BY 4.0 Unported |
Link to License: | https://creativecommons.org/licenses/by/4.0/ |
Appears in Collections: | Physik |
This item is licensed under a Creative Commons License