X-ray observation of a helium atom and placing a nitrogen atom inside He@C60 and He@C70

Yuta Morinaka, Satoru Sato, Atsushi Wakamiya, Hidefumi Nikawa, Naomi Mizorogi, Fumiyuki Tanabe, Michihisa Murata, Koichi Komatsu, Ko Furukawa, Tatsuhisa Kato, Shigeru Nagase, Takeshi Akasaka and Yasujiro Murata ()
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Yuta Morinaka: Institute for Chemical Research, Kyoto University
Satoru Sato: Life Science Center of Tsukuba Advanced Research Alliance, University of Tsukuba
Atsushi Wakamiya: Institute for Chemical Research, Kyoto University
Hidefumi Nikawa: Life Science Center of Tsukuba Advanced Research Alliance, University of Tsukuba
Naomi Mizorogi: Life Science Center of Tsukuba Advanced Research Alliance, University of Tsukuba
Fumiyuki Tanabe: Institute for Chemical Research, Kyoto University
Michihisa Murata: Institute for Chemical Research, Kyoto University
Koichi Komatsu: Institute for Chemical Research, Kyoto University
Ko Furukawa: Institute for Molecular Science
Tatsuhisa Kato: Institute for the Promotion of Excellence in Higher Education, Kyoto University, Yoshida Nihonmatsu-cho
Shigeru Nagase: Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Takano-Nishihiraki-cho
Takeshi Akasaka: Life Science Center of Tsukuba Advanced Research Alliance, University of Tsukuba
Yasujiro Murata: Institute for Chemical Research, Kyoto University

Nature Communications, 2013, vol. 4, issue 1, 1-5

Abstract: Abstract Single crystal X-ray analysis has been used as a powerful method to determine the structure of molecules. However, crystallographic data containing helium has not been reported, owing to the difficulty in embedding helium into crystalline materials. Here we report the X-ray diffraction study of He@C60 and the clear observation of a single helium atom inside C60. In addition, the close packing of a helium atom and a nitrogen atom inside fullerenes is realized using two stepwise insertion techniques, that is, molecular surgery to synthesize the fullerenes encapsulating a helium atom, followed by nitrogen radio-frequency plasma methods to generate the fullerenes encapsulating both helium and nitrogen atoms. Electron spin resonance analysis reveals that the encapsulated helium atom has a small but detectable influence on the electronic properties of the highly reactive nitrogen atom coexisting inside the fullerene, suggesting the potential usage of helium for controlling electronic properties of reactive species.

Date: 2013
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DOI: 10.1038/ncomms2574

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