Abstract
C 80 fulleren cage can be used to realize confinement with the highest possible icosahedral ( I h) symmetry. As examples, La 2@C 80 and Sc 3C 2@C 80 are molecules in which metal dimer and trimer are encapsulated within the C 80 cage. They are recently purified in the substantial amount by using a high performance liquid chromatograph (HPLC), and studied by spectroscopy and X-ray diffraction. The confinement of the metal cluster with the high symmetry ( I h) cage is reflected in their specific potential of the intra-molecular rotation for the cluster. The result of electron spin resonance (ESR) measurements indicates that the intra-molecular potential is modified by the chemical modification of the C 80 cage as well as by the injection of an excess electron.
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