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.

内嵌金属富勒烯是近年来备受关注的新型富勒烯基材料。近年来，同步x射线衍射和13c核磁共振在金属富勒烯“直接”结构分析方面取得了一些重要进展。最近，我们已经成功地确定了金属富勒烯Y@C82的内嵌性质，并通过同步加速器x射线粉末衍射获得了它的总电子密度(1)。结果表明，钇原子从C82分子中心位移，与碳笼紧密结合。在本研究中，通过高分辨率13C-NMR(2)和同步加速器x射线衍射研究，首次确定了典型二金属富勒烯Sc2@C84的异构体和内腔结构。结果表明，Sc2@C84的主要同分异构体之一Sc2@C84 （III）具有D2d（23）对称性，Sc离子的动力学平均可能发生在最佳钪位置附近。这与Y@C82的情况形成了鲜明的对比，在这种情况下，即使在室温下，钇原子也附着在碳笼上。并对Y@C82和Sc2@C84晶体结构的一些重要特征进行了介绍和讨论。

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。

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。

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。

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。