烯C60是否足够大,可以容纳多重结合的二金属?
Ivan Infante1, Laura Gagliardi, Gustavo E Scuseria
1Department of Physical Chemistry, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland.
Journal of the American Chemical Society
|May 16, 2008
概括
计算量子化学揭示了二金属的富勒烯. 二元体 (U2) 在C60中形成一个人造的内分体复合体,但在较大的富勒伦中以外分体结合.
科学领域:
- 计算化学是一种计算化学.
- 量子化学是一种量子化学.
- 材料科学是一种材料科学.
背景情况:
- 双金属勒烯是含有两个金属原子的化合物,它们被封装在勒烯内或与勒烯结合.
- 了解金属二次体和富勒烯之间的相互作用对于设计新材料至关重要.
研究的目的:
- 用计算量子化学研究二金属富勒伦M2@C60的结构和结合特性.
- 为了阐明富勒烯子尺寸对封装金属二次体,特别是的行为的影响.
主要方法:
- 用密度函数理论 (DFT) 的计算来建模研究系统的电子结构和几何.
- 考虑了各种富勒烯 (C60,C70,C84) 和过渡金属二极体 (Cr2,Mo2,W2,U2) 的情况.
主要成果:
- Cr2,Mo2和W2形成异面体复合体,与C60子的外部结合.
- 二元体 (U2) 在C60中形成一个高度对称的内分体复合体,U-U键保持完好.
- 在较大的子 (C70,C84) 中,U2优先与内壁结合,导致U-U键的解离.
结论:
- 富勒烯腔的尺寸显著影响封装金属二极管的结合方式和结构完整性.
- 在C60中观察到的U2的内体结构是小腔体大小的工件,不代表其在更大的富勒伦中表现的行为.
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