Toward Negatively Curved Carbons,Accounts of Chemical Research

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Toward Negatively Curved Carbons
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1021/acs.accounts.8b00140
Sai Ho Pun ₁ , Qian Miao ₁

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Negatively curved carbons are theoretical carbon allotropes as proposed by embedding heptagons or octagons in a graphitic lattice. Unlike five-membered rings in fullerenes, which induce positive curvature, the seven- or eight-membered rings induce negative curvature, giving rise to a variety of esthetic carbon nanostructures known as Mackay crystals or carbon schwarzites. In addition, hypothetical toroidal carbon nanotubes consisting of five-, six-, and seven-membered rings present positive curvature on the outside and negative curvature on the inside of the torus. These carbon allotropes with negative curvature are predicted to have interesting properties and potential applications on the basis of computational studies but are yet to be synthesized. A promising bottom-up approach to these intriguing but still imaginary carbon structures is organic synthesis of negatively curved polycyclic arenes, which are also known as negatively curved nanographenes. They not only are segments of negatively curved carbon allotropes containing important structural information but also can in principle be used as templates or monomer units for the synthesis of carbon schwarzites and toroidal carbon nanotubes.

中文翻译：

走向负弯曲碳

负弯曲碳是理论上的碳同素异形体，是通过将七边形或八边形嵌入石墨晶格中提出的。与富勒烯中的五元环引起正曲率不同，七元或八元环引起负曲率，从而产生了多种被称为Mackay晶体或碳纤锌矿的美学碳纳米结构。另外，由五元，六元和七元环组成的假想的环形碳纳米管在圆环的外部呈现正曲率，在圆环的内部呈现负曲率。在计算研究的基础上，这些具有负曲率的碳同素异形体预计具有有趣的性质和潜在应用，但尚未进行合成。对于这些有趣但仍虚构的碳结构，一种有希望的自下而上的方法是负弯曲多环芳烃的有机合成，也称为负弯曲纳米石墨烯。它们不仅是负弯的碳同素异形体的片段，包含重要的结构信息，而且原则上也可以用作合成碳Schwarzite和环形碳纳米管的模板或单体单元。

更新日期：2018-07-05

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