Adsorption of Clusters on Clean Surfaces

簇在清洁表面上的吸附

• 批准号: 06403006
• 负责人: SHINOHARA Hisanori
• 金额: $ 14.98万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06403006/
• 关键词: Microchuster; Clean Surface; Laser-Vaporization; Fullerene; Cluster Beam

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.

内膜甲基氟烯烯是新型富勒烯的材料，在过去四年中引起了很多关注。在过去的几年中，通过使用Synchrotron X射线衍射和13C-NMR研究，在金属氟烯烯的“直接”结构分析中取得了一些重要进展。最近，我们成功地确定了金属氟烯，y@c82的内膜性质，并通过Synchrotron X射线粉末衍射获得了其总电子密度（1）。结果表明，Yttrium原子从C82分子的中心取代，并与碳笼有很强的结合。在本研究中，典型的di-Metallofullerene，SC2@C84的异构体和内膜结构首次由高分辨率13C-NMR（2）diffror x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray x-ray。结果表明，SC2@C84的主要异构体之一，即SC2@C84（III）具有D2D（23）对称性，并且SC离子的某些动态平均可能发生在最佳的丑闻位置。这与y@c82案例形成鲜明对比，即使在室温下，yttrium原子也连接到碳笼。还出现并讨论了y@c82和sc2@c84的晶体结构的一些重要特征。

项目成果

X.D.Wang: "FI-STM Study of the Structure of Sc-Fullerenes" Appl.Surf.Sci.76/77. 329-333 (1994)

X.D.Wang：“Sc-富勒烯结构的 FI-STM 研究”Appl.Surf.Sci.76/77。

X.D.Wang: "Imaging of C_<70> Intramolecular Struetures with STM" Phys.Rev.B. 49. 14746-14749 (1994)

X.D.Wang：“利用 STM 对 C_<70> 分子内结构进行成像”Phys.Rev.B。

T. Takahashi: "Divalent Scandium Atoms in The Cage of C_<84>" Phys. Rev. B. 52. 13812-13814 (1995)

T. Takahashi：“C_<84> 笼中的二价钪原子”物理。

M. Takata: "Confirmation by X-ray Diffraction of The Endohedral Nature of The Metallofullerenes Y@C_<82>" Nature. 377. 46-48 (1995)

M. Takata：“通过 X 射线衍射确认金属富勒烯 Y@C_<82> 的内嵌性质”性质。

T.Kato et al.: "ESR Study on Structures and Dynamics of Sc_3@C_<82>" J.Phys.Chem.99. 856-858 (1995)

T.Kato 等人：“Sc_3@C_<82> 结构和动力学的 ESR 研究”J.Phys.Chem.99。