Supertwistacene: A Helical Graphene Nanoribbon
Supertwistacene: A Helical Graphene Nanoribbon
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Supertwistacene：螺旋石墨烯纳米带
DOI：
10.1021/jacs.0c08555
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发表时间：
2020-09-30
影响因子：
15
通讯作者：
Wang, Jiaobing
中科院分区：
文献类型：
--
作者：
Ma, Shuang;Gu, Jiajian;Wang, Jiaobing
这项工作描述了一种合成的手性石墨烯纳米载体，命名为supertwistacene 1。它具有四个以螺旋方式线性稠合的超苯（HBC）单元。通过单晶X射线衍射确认了长度为1.4.3nm的结构，具有117度的端到端扭转。与各种扭并苯化合物及其类似物相比，1具有非常稳定的构型。即使在200 ℃下加热16小时，它也能抵抗热异构化。通过手性HPLC获得的对映体纯1在直至600 nm的宽光谱范围内显示出不同的CD信号。此外，还制备了1的两个较小的同系物，三聚体2和二聚体3，并进行了系统的研究。结合对1-3的理论和实验研究，给出了它们的（啁啾）光学和电学特性的全貌。
This work describes a synthetic chiral graphene nanoribbon, named supertwistacene 1. It has four superbenzene (HBC) units linearly fused in a helical manner. The structure of 1, 4.3 nm in length, with an end-to-end twist of 117 degrees, was confirmed by single-crystal X-ray diffraction. In contrast to various twistacene compounds and their analogues, 1 has a very stable configuration. It resists thermal isomerization even when being heated at 200 degrees C for 16 h. Enantiopure 1 obtained by chiral HPLC shows distinct CD signals in a broad spectral range until 600 nm. In addition, two smaller congeners of 1, the trimer 2 and the dimer 3, were also prepared and systematically investigated. Combining theoretical and experimental studies on 1-3 presents a big picture on their (chir)optical and electronic characteristics.