Magnetically Induced Current-Density Susceptibility of Circum[n]coronenes.

IF 2.7 2区 化学 Q3 CHEMISTRY, PHYSICAL
The Journal of Physical Chemistry A Pub Date : 2025-01-16 Epub Date: 2025-01-04 DOI:10.1021/acs.jpca.4c07293
Qian Wang, Stefan Taubert, Dage Sundholm
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引用次数: 0

Abstract

We have calculated the magnetically induced current density (MICD) susceptibility at the all-electron density functional theory level for a series of coronoid molecules of increasing size and compared the MICD susceptibilities with those calculated using the pseudo-π (PP) model. The molecules sustain global diatropic magnetically induced ring currents (MIRCs), whereas paratropic MICD vortices mainly appear inside the benzene rings. The computationally cheaper PP calculations were also employed on circum[n]coronene molecules showing that the MICD pattern continues to alternate for odd and even n when increasing the size of the molecule. For even n, there is a local paratropic MIRC in the middle of the molecule, whereas when n is odd, the PP models do not sustain any paratropic MIRC pathways. The global diatropic MIRC flowing mainly along the outer edge of the molecule increases with increasing n suggesting that there is no size limit of the MIRC of circum[n]coronene molecules. There are seven weakly aromatic Clar rings in the middle of the PP model of the circum[n]coronene molecules with odd n, whereas circum[n]coronene molecules with even n have no Clar rings. There are no Clar rings in the outer part of the circum[n]coronene molecules with n > 1.

环形[n]日冕的磁致电流密度敏感性。
我们在全电子密度泛函理论水平上计算了一系列尺寸不断增大的冕状分子的磁感应电流密度(MICD)磁化率,并将其与伪π (PP)模型计算的磁化率进行了比较。分子维持全局的各向异性磁致环电流(MIRCs),而各向异性磁致环涡旋主要出现在苯环内部。计算成本更低的PP计算也被用于环[n]冕烯分子,结果表明,当增加分子的大小时,MICD模式继续在奇数和偶数n之间交替。当n为偶数时,在分子中间存在局部的顺向MIRC,而当n为奇数时,PP模型不支持任何顺向MIRC通路。主要沿分子外缘流动的全球对流层MIRC随n的增加而增加,表明环[n]冠烯分子的MIRC没有大小限制。具有奇数n的环[n]冠烯分子的PP模型中间有7个弱芳的Clar环,而具有偶数n的环[n]冠烯分子没有Clar环。在环外[n]个带n > 1的冕烯分子中没有环状物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
The Journal of Physical Chemistry A
The Journal of Physical Chemistry A 化学-物理:原子、分子和化学物理
CiteScore
5.20
自引率
10.30%
发文量
922
审稿时长
1.3 months
期刊介绍: The Journal of Physical Chemistry A is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.
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