Implications of Nitrogen Doping on Geometrical and Electronic Structure of the Fullerene Dimers

• 作者: Yin Su Zuo-Chang Chen Han-Rui Tian Yun-Yan Xu Qianyan Zhang Su-Yuan Xie Lan-Sun Zheng
• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Concise Reports
• 页码范围: 93-98
• 页数: 6页
• 语种: 英文
• DOI: 10.1002/cjoc.202000345

摘要

Because of its unsaturated bonds,C60 is susceptible to polymerize into dimers.The implications of nitrogen doping on the geometrical and electronic structure of C60 dimers have been ambiguous for years.A quarter-century after the discovery of azafullerene dimer(C59N)2,we reported its single crystallographic structure in 2019.Herein,the unambiguous crystal structure information of(C59N)2 is elucidated specifically,revealing that the inter-cage C-C single bond length of(C59N)2 is comparable with that of an ordinary C(sp3)-C(sp3)single bond,and that the most stable conformer of(C59N)2 is gauche-conformer with a dihedral angle of 66°.To amend the structural deviations,geometrical structure of(C59N)2 is optimized by a B3LYP-D3BJ function,which is proved to be more con-sistent with its single crystal structure than those by the commonly used B3LYP function.Moreover,the calculation method is also suitable for other representative fullerene dimers,such as(C60)2 and its divalent anion.Additionally,the dissociation of(C59N)2 at 473 K under mass spectrometric conditions suggests the inter-cage C-C bond is relatively weaker than an ordinary C-C single bond,which can be explained by the interaction energies of inter-cages.