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A luminescent single-molecule magnet of dimetallofullerene with cage-dependent properties
Mingzhe Nie1, Le Yang2, Chong Zhao1
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. wangtais@iccas.ac.cn crwang@iccas.ac.cn and University of Chinese Academy of Sciences, Beijing 100049, China.
Abstract:
It is important to explore luminescent single-molecule magnets (SMMs) to promote their application in high-density data storage. Herein, we report two dimetallofullerenes of DyEr@C82 isomers, which exhibit cage-dependent single-molecule magnet behavior and photoluminescence properties. DyEr@C82 isomers were characterized with a Cs and C3v cage symmetry by UV-vis-NIR spectroscopy and single-crystal X-ray diffraction analysis. Magnetic results revealed that DyEr@C3v-C82 displays SMM behavior below 3 K, whereas DyEr@Cs-C82 is a paramagnet. In addition, photoluminescence (PL) was also observed for both of these two isomers, whose peak patterns are different. Theoretical calculations revealed the presence of a one-electron-two-center Dy-Er bond in these two isomers, and different electronic structures of DyEr@Cs-C82 and DyEr@C3v-C82, which agrees well with the experimental results. These results show that dimetallofullerenes are promising magneto-luminescent materials with varied properties.
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