An sp-hybridized all-carboatomic ring, cyclo[18]carbon: Electronic structure, electronic spectrum, and optical nonlinearity

被引:1290
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
2ND HYPERPOLARIZABILITY; 1ST HYPERPOLARIZABILITY; DOUBLE AROMATICITY; DENSITY ANALYSIS; BASIS-SETS; CARBON; MOLECULES; TOPOLOGY; DESIGN; HUCKEL;
D O I
10.1016/j.carbon.2020.05.023
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
The electronic spectrum and optical nonlinearity of the sp-hybridized cyclo[18]carbon with novel topology are studied by means of (time-dependent) density functional theory calculations. Molecular orbital analysis shows that the energy levels of sigma molecular orbitals of the cyclo[18]carbon are very low, and the energies of two sets of high-lying pi molecular orbitals, which are perpendicular with each other, are almost the same. The simulated absorption spectrum shows that the cyclo[18]carbon exhibits two detectable absorption bands corresponding to pi ->pi* transition: one strong absorption at 219.4 nm and one weak absorption at 191.4 nm. The considerable oscillator strength of the maximum absorption peak has detailedly investigated via theoretical analysis. Accurate calculation of molecular response properties shows that the cyclo[18]carbon has apparent nonlinear anisotropy due to its two-dimensional looping structure. In particular, the cyclo[18]carbon shows a great second-order hyperpolarizability and displays an obvious optical dispersion in optical nonlinearity. Further analysis of hyperpolarizability density reveals the nature of the great nonlinear optical properties of the studied cyclo[18]carbon. (c) 2020 Elsevier Ltd. All rights reserved.
引用
收藏
页码:461 / 467
页数:7
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