
Article Title
Synthesis of a lithium-encapsulated fullerenol and the effect of the internal lithium cation on its aggregation behavior
Keywords
Endohedral fullerene, fullerenol, lithium cation, cation-encapsulated anion nanoparticle, electrostatic interaction
Abstract
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.
Graphical Abstract
Publisher
Tsinghua University Press
Recommended Citation
Hiroshi Ueno,Yuji Nakamura,Naohiko Ikuma,Ken Kokubo,Takumi Oshima, Synthesis of a lithium-encapsulated fullerenol and the effect of the internal lithium cation on its aggregation behavior. NanoRes.2012, 5(8): 558–564