Wu Bo, Wang Taishan, Feng Yongqiang, Zhang Zhuxia, Jiang Li, Wang Chunru
Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Nat Commun. 2015 Mar 3;6:6468. doi: 10.1038/ncomms7468.
The endohedral fullerenes lead to well-protected internal species by the fullerene cages, and even highly reactive radicals can be stabilized. However, the manipulation of the magnetic properties of these radicals from outside remains challenging. Here we report a system of a paramagnetic metallofullerene Sc3C2@C80 connected to a nitroxide radical, to achieve the remote control of the magnetic properties of the metallofullerene. The remote nitroxide group serves as a magnetic switch for the electronic spin resonance (ESR) signals of Sc3C2@C80 via spin-spin interactions. Briefly, the nitroxide radical group can 'switch off' the ESR signals of the Sc3C2@C80 moiety. Moreover, the strength of spin-spin interactions between Sc3C2@C80 and the nitroxide group can be manipulated by changing the distance between these two spin centres. In addition, the ESR signals of the Sc3C2@C80 moiety can be switched on at low temperatures through weakened spin-lattice interactions.
内嵌富勒烯通过富勒烯笼使内部物种得到良好保护，甚至高活性自由基也能被稳定下来。然而，从外部操控这些自由基的磁性仍然具有挑战性。在此，我们报道了一个由顺磁性金属富勒烯Sc3C2@C80与一个氮氧自由基相连组成的体系，以实现对金属富勒烯磁性的远程控制。远程氮氧基团通过自旋 - 自旋相互作用作为Sc3C2@C80电子自旋共振（ESR）信号的磁开关。简而言之，氮氧自由基基团能够“关闭”Sc3C2@C80部分的ESR信号。此外，Sc3C2@C80与氮氧基团之间的自旋 - 自旋相互作用强度可通过改变这两个自旋中心之间的距离来操控。另外，在低温下，通过减弱自旋 - 晶格相互作用，Sc3C2@C80部分的ESR信号能够被重新开启。
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