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Nano Research

, Volume 5, Issue 8, pp 558–564 | Cite as

Synthesis of a lithium-encapsulated fullerenol and the effect of the internal lithium cation on its aggregation behavior

  • Hiroshi Ueno
  • Yuji Nakamura
  • Naohiko Ikuma
  • Ken KokuboEmail author
  • Takumi Oshima
Research Article

Abstract

A lithium-encapsulated fullerenol Li@C60(OH)18, as an example of a polar solvent-soluble endohedral fullerene derivative, has been synthesized and fully characterized by infrared spectroscopy, nuclear magnetic resonance spectroscopy, UV spectroscopy, electron spin resonance (ESR) spectroscopy, matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF-MS), elemental analysis, thermogravimetric analysis, and inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and the particle size was determined using the induced grating (IG) method, and scanning probe microscopy. The encapsulated Li+ was clearly detected by 7Li NMR at very high field in the range −15 to −19 ppm, an intermediate lithium-encapsulated fullerenol was detected by MALDI-TOF-MS, and the molar ratio of lithium-encapsulated fullerenol to empty fullerenol was quantitatively determined to be 12:88 by ICP-AES. The solid-state ESR and particle size measurements using the IG method showed the characteristic anionic behavior with no external counter cations, in what can be called a “cation-encapsulated anion nanoparticle”, revealing the drastic differences between its properties and those of empty C60(OH)16.

Keywords

Endohedral fullerene fullerenol lithium cation cation-encapsulated anion nanoparticle electrostatic interaction 

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Supplementary material

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Hiroshi Ueno
    • 1
  • Yuji Nakamura
    • 1
  • Naohiko Ikuma
    • 1
  • Ken Kokubo
    • 1
    Email author
  • Takumi Oshima
    • 1
  1. 1.Division of Applied Chemistry, Graduate School of EngineeringOsaka UniversitySuita, OsakaJapan

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