Putting Metal Atoms into Fullerenes(STM-C_<60>)
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概要
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Endohedral metallofullerenes are novel forms of fullerene-related materials which can encage various types of metal atom(s) in a various size of fullerene cages. In this article, recent advances on the production, separation (isolation) and various spectroscopic characterization of endohedral metallofullerenes are presented in order to clarify their structural and electronic properties. Endohedral metallofullerenes are normally produced by the DC arc-discharge method with metal/graphite composite rods as positive electrodes (Fig. 1). The endohedral metallofullerenes so far produced are centered on rare earth metallofullerenes such as Sc, Y, La, Ce, Pr and Gd which are encapsulated mainly in the C_<82> fullerene. By using an elaborate HPLC (High Performance Liquid Chromatography) technique, these metallofullerenes are completely purified and isolated like C_<60> and C_<70>. It has been revealed by ESR (Electron Spin Resonance) and theoretical calculations that substantial electron transfers are taking place from the encaged metal atom to the carbon cage : intra-fullerene electron transfers. Recent synchrotron X-ray diffraction studies shows that a metal atom is not in the center of fullerenes but very close to the carbon cages, indicating the presence of a strong metal-cage interaction. Up to the present, various spectroscopic and structural analyses including UPS, TEM, EXAFS, STM, ESR, ^<13>C-NMR and X-ray diffraction have been performed to elucidate their novel molecular and solid state properties. Some prospective applications of the metallofullerenes are also presented.endohedral metallofullerenetwo-stage HPLCESRSTMX-ray diffraction
- 東北大学の論文
- 1997-03-28
著者
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Shinohara Hisanori
Department Of Chemistry Nagoya University
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Shinohara Hisanori
Department Of Cardiology And Clinical Research National Hospital Organization Zentsuji Hospital
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Shinohara Hisanori
Department Of Cardiology And Clinical Research
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