A hard molecular nanomagnet from confined paramagnetic 3d-4f spins inside a fullerene cage

Chenli Huang, Rong Sun, Lipiao Bao (), Xinyue Tian, Changwang Pan, Mengyang Li, Wangqiang Shen, Kun Guo, Bingwu Wang (), Xing Lu () and Song Gao
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Chenli Huang: Huazhong University of Science and Technology
Rong Sun: Peking University
Lipiao Bao: Huazhong University of Science and Technology
Xinyue Tian: Huazhong University of Science and Technology
Changwang Pan: Huazhong University of Science and Technology
Mengyang Li: Xidian University
Wangqiang Shen: Huazhong University of Science and Technology
Kun Guo: Huazhong University of Science and Technology
Bingwu Wang: Peking University
Xing Lu: Huazhong University of Science and Technology
Song Gao: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Reducing inter-spin distance can enhance magnetic interactions and allow for the realization of outstanding magnetic properties. However, achieving reduced distances is technically challenging. Here, we construct a 3d-4f metal cluster (Dy2VN) inside a C80 cage, affording a heretofore unseen metallofullerene containing both paramagnetic 3d and 4f metal ions. The significantly suppressed 3d-4f (Dy-V) distances, due to the unique cage confinement effect, were observed by crystallographic and theoretical analysis of Dy2VN@Ih(7)-C80. These reduced distances result in an enhanced magnetic coupling (Jtotal, Dy-V = 53.30 cm−1; Jtotal, Dy-Dy = −6.25 cm−1), leading to a high magnetic blocking temperature compared to reported 3d-4f single-molecule magnets and strong coercive field of 2.73 Tesla. Our work presents a new class of single-molecule magnets with both paramagnetic 3d and 4f metals confined in a fullerene cage, offering superior and tunable magnetic properties due to the unique cage confinement effect and the diverse composition of the entrapped magnetic core.

Date: 2023
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DOI: 10.1038/s41467-023-44194-y

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