Visualisation of Chemical Shielding Tensors (VIST) to Elucidate Aromaticity and Antiaromaticity.

Visualisation of Chemical Shielding Tensors (VIST) to Elucidate Aromaticity and Antiaromaticity.
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DOI:
10.1002/ejoc.202100352
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发表时间:
2021-05-07
影响因子:
2.8
通讯作者:
Glöcklhofer F
Glöcklhofer F
中科院分区:
化学3区
文献类型:
--
作者:
Plasser F;Glöcklhofer F

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芳香性是化学中的一个中心概念,从生物化学到材料科学都有涉及。最近,化学家也开始利用复杂的现象,如局部和全局(反)芳香性或非平面系统和三维中芳香性的相互作用。这些现象对我们的基本理解和芳香性的实际可视化提出了新的挑战。为了克服这些挑战,这里开发了一种用于化学屏蔽张量(VIST)的可视化的方法,该方法允许具有关于化学屏蔽的局部变化和各向异性的定量信息的3D可视化。在不同平面烃中举例说明该方法后,我们研究了两种非平面大环,以显示VIST方法对具有竞争性π共轭体系的分子的独特优势,并得出结论,去甲可咯二聚体显示出通过空间芳香性的明确证据。我们相信,VIST方法将是一个非常有价值的除了计算工具箱。化学屏蔽张量(VIST)的可视化方法的开发,它提供了一个图形表示的芳香性和反芳香性,它们的局部变化,和各向异性。该方法提供了独特的见解迷人的现象,如相互作用的芳香性和反芳香性的大环与竞争的π共轭体系。
Aromaticity is a central concept in chemistry, pervading areas from biochemistry to materials science. Recently, chemists also started to exploit intricate phenomena such as the interplay of local and global (anti)aromaticity or aromaticity in non‐planar systems and three dimensions. These phenomena pose new challenges in terms of our fundamental understanding and the practical visualisation of aromaticity. To overcome these challenges, a method for the visualisation of chemical shielding tensors (VIST) is developed here that allows for a 3D visualisation with quantitative information about the local variations and anisotropy of the chemical shielding. After exemplifying the method in different planar hydrocarbons, we study two non‐planar macrocycles to show the unique benefits of the VIST method for molecules with competing π‐conjugated systems and conclude with a norcorrole dimer showing clear evidence of through‐space aromaticity. We believe that the VIST method will be a highly valuable addition to the computational toolbox. A method for the visualisation of chemical shielding tensors (VIST) is developed, which provides a graphical representation of aromaticity and antiaromaticity, their local variations, and anisotropy. The method provides unique insight into fascinating phenomena such as the interplay of aromaticity and antiaromaticity in macrocycles with competing π‐conjugated systems.
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