1995 Fiscal Year Final Research Report Summary
Adsorption of Clusters on Clean Surfaces
| Project/Area Number |
06403006
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical chemistry
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| Research Institution | Nagoya University |
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Principal Investigator |
SHINOHARA Hisanori Nagoya Univ・,Faculty of Science, Professor, 理学部, 教授 (50132725)
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| Co-Investigator(Kenkyū-buntansha) |
SUGAI Toshiki Nagoya Univ.・,Faculty of Science, Assistant Professor, 理学部, 助手 (50262845)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Microchuster / Clean Surface / Laser-Vaporization / Fullerene / Cluster Beam |
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| Research Abstract |
Endohedral metallofullerenes are novel fullerene-based materials and have attracted much attention in the last four years. In the last couple of years, some important progress have been made in "direct" structural analyzes of metallofullerenes by using synchrotron X-ray diffraction and 13C-NMR studies. Recently, we have succeeded in determining the endohedral nature of the metallofullerene, Y@C82, and obtaining its total electron density via synchrotron X-ray powder diffraction (1). The results reveal that the yttrium atom is displaced from the center of the C82 molecule and is strongly bound to the carbon cage.
In the present study, both the isomer and the endohedral structures of a typical di- metallofullerene, Sc2@C84, have been determined for the first time by high-resolution 13C-NMR (2) and synchrotron X-ray diffraction studies, respectively. The results show that one of the major isomer of Sc2@C84, i.e., Sc2@C84 (III), has a D2d (23) symmetry and that some dynamical averaging of the Sc ions might be taking place around the optimum scandium position. This is a striking contrast to the Y@C82 case, where the yttrium atom is attached to the carbon cage even at room temperature.
Some important features of the crystal structures of Y@C82 and Sc2@C84 were also presented and discussed.
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