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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (13): 1421-1424. 上一篇    下一篇

研究论文

内掺三金属氮化物富勒烯Er3N@C80的几何结构与电子性质理论研究

唐春梅*,a,b 朱卫华*,a 邓开明b

  

  1. (a河海大学理学院 南京 210098)
    (b南京理工大学应用物理系 南京 210094)

  • 投稿日期:2008-10-07 修回日期:2008-12-16 发布日期:2009-07-14
  • 通讯作者: 唐春梅

Theoretical Study of the Structural and Electronic Properties of Er3N@C80

Tang, Chunmei *,a,b Zhu, Weihua *,a Deng, Kaiming b

  

  1. (a College of Science, Hohai University, Nanjing 210098)
    (b Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094)
  • Received:2008-10-07 Revised:2008-12-16 Published:2009-07-14
  • Contact: Tang, Chunmei

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1277

被引次数

4

采用密度泛函理论中的广义梯度近似对Ih-Er3N@C80的几何结构和电子性质进行理论研究. 结构优化发现当Er3N的三个Er原子偏离Ih-C80中五边形和六边形公共边中点时形成的结构最稳定. Er—C和Er—N键是离子键. 能级分析可知: 掺入Er3N后, 碳笼的稳定性提高. 局部态密度图和自旋聚居数分析表明: Er3N的掺入使Ih-C80磁性变大, 而Er3N仍然具有一定的磁性. 垂直电离能和垂直亲和能分析表明: 掺入Er3N后, 碳笼的得失电子能力都有所降低.

关键词: C80, Er3N@C80, 内掺富勒烯, 密度泛函理论

The generalized gradient approximation based on density functional theory was used to analyze the structural and electronic properties of the Ih-Er3N@C80, finding that the structure with the three Er atoms situated off the center of the common bond of the hexagon and pentagon in Ih-C80 is the most stable. The Er—C and Er—N bonds mainly have the ionic characters. It can be known from the energy levels that the stability of the cage increases much after doping the Er3N molecule. It can be discovered from the spin density and the partial density of states of the Ih-Er3N@C80 that after encaging the Er3N, the magnetic moment of the Ih-C80 increases, while that of the Er3N is not completely quenched. It can be explored from the vertical ionization potential and the vertical electron affinities that the abilities for both detaching and obtaining electrons of Ih-Er3N@C80 are decreased a little.

Key words: C80, Er3N@C80, endohedral fullerene, density functional theory