An sp-hybridized all-carboatomic ring, cyclo[18]carbon: Bonding character, electron delocalization, and aromaticity

被引:293
作者
Liu, Zeyu [1 ]
Lu, Tian [2 ]
Chen, Qinxue [2 ]
机构
[1] Jiangsu Univ Sci & Technol, Coll Biotechnol, Zhenjiang 212018, Jiangsu, Peoples R China
[2] Beijing Kein Res Ctr Nat Sci, Beijing 100022, Peoples R China
关键词
AB-INITIO CALCULATION; ZETA VALENCE QUALITY; 1ST HYPERPOLARIZABILITY; LOCALIZATION FUNCTION; DENSITY FUNCTIONALS; BASIS-SETS; CARBON; ATOM; MOLECULES; ANISOTROPY;
D O I
10.1016/j.carbon.2020.04.099
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
cyclo[18]carbon is an all-carboatomic ring observed recently in experiment. Inspired by the distinctive feature in structure and bonding nature, we explored comprehensively its bonding character, electron delocalization, and aromaticity by quantum chemistry calculation and wavefunction analysis. Bond order analysis reveals that this sp-hybridized all-carboatomic ring exhibits a structure of alternating short and long C-C bonds with D-9h symmetry, rather than a polyyne with strict triple and single bonds as declared in experiment. Our in-depth investigations in terms of localized orbital and real space function analyses not only confirm this conclusion, but also provide a lot of useful information about electronic structure. Further electron delocalization analysis shows that the cyclo[18]carbon possesses two perpendicular pi systems, and the 4n + 2 pi electrons of each one exhibit strong delocalization behavior. Under the action of external magnetic field, the cyclo[18]carbon shows a significant induced ring current, which reveals its remarkable aromatic characteristic. (c) 2020 Elsevier Ltd. All rights reserved.
引用
收藏
页码:468 / 475
页数:8
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