Preparation of endohedral fullerene containing lithium (Li@C60) and isolation as pure hexafluorophosphate salt ([Li+@C 60][PF6-])

Hiroshi Okada, Takashi Komuro, Takeshi Sakai, Yutaka Matsuo, Yoshihiro Ono, Kenji Omote, Kuniyoshi Yokoo, Kazuhiko Kawachi, Yasuhiko Kasama, Shoichi Ono, Rikizo Hatakeyama, Toshiro Kaneko, Hiromi Tobita

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Abstract

A synthetic protocol for endohedral fullerene containing lithium (Li@C 60), as well as the synthesis, characterization, and properties of its chemically oxidized derivative [Li+@C60][PF 6-] are reported in full. Simultaneous deposition of Li plasma and C60 produces a mixture containing Li@C60 and C60. Strong intermolecular attraction between Li@C60 and C60 has prevented their separation, but this obstacle was surmounted by selective chemical oxidation of Li@C60, which led to the isolation of a substantial amount of pure [Li+@C60][PF 6-]. For this purpose, an HPLC technique using an electrolyte in the mobile phase was effective in purifying the ionic metallofullerene. [Li+@C60][PF6-] was stable in air and, compared with [Li+@C60][SbCl 6-], was more stable to moisture and various chemicals. [Li+@C60][PF6-] holds promise for practical applications. The spectroscopic data (MS, 7Li and 13C NMR, UV-vis, and IR) and electrochemical data for [Li +@C60][PF6-] are disclosed. In addition, the high electron affinity of [Li+@C60][PF 6-] is discussed.

Original languageEnglish
Pages (from-to)10624-10631
Number of pages8
JournalRSC Advances
Volume2
Issue number28
DOIs
Publication statusPublished - 2012 Nov 14

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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    Okada, H., Komuro, T., Sakai, T., Matsuo, Y., Ono, Y., Omote, K., Yokoo, K., Kawachi, K., Kasama, Y., Ono, S., Hatakeyama, R., Kaneko, T., & Tobita, H. (2012). Preparation of endohedral fullerene containing lithium (Li@C60) and isolation as pure hexafluorophosphate salt ([Li+@C 60][PF6-]). RSC Advances, 2(28), 10624-10631. https://doi.org/10.1039/c2ra21244g