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A graphyne spoked wheel
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DOI：10.1016/j.chempr.2022.08.002.png)
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摘要
En 中文
y-Graphyne is an emerging carbon allotrope, and synthesis of large -size atomically precise y-graphyne fragments would be crucial to un-derstand its distinctive properties. Herein, a long-sought-after graphyne spoked wheel with 6-fold symmetry was synthesized mainly through cobalt(0)-catalyzed cyclotrimerization of a triyne in-termediate followed by 12-fold intramolecular Stille coupling reac-tions. Its structure was unambiguously confirmed by X-ray crystallo-graphic analysis, which revealed a closely stacked dimer structure. NMR and theoretical analysis disclosed that fusion of six anti -aro-matic hexadehydro[12]annulene units led to a decrease in local aromaticity of all seven benzenoid rings (particularly, the central one), which is quite different from a graphene analog, hexa-peri-hexabenzocoronene (HBC). Its optical and electrochemical proper-ties are also different from those of HBC, showing allowed HOMO / LUMO electronic transition and facile electrochemical reduction. This study provided a new method for the synthesis of even larger y-graphyne fragments and demonstrated the unique electronic properties and packing structure of y-graphyne as compared with those of graphene.
Keyword:
ELECTRONIC-PROPERTIES
CHEMICAL-SHIFTS
CARBON
SUBSTRUCTURES
GRAPHDIYNE
COMPLEX
DEHYDROBENZOANNULENES
AROMATICITY
PREDICTIONS
NANOTUBES
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期刊
IF:
19.6
论文数:
2.8K
被引数:
3.0W
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分享收藏RETRACTED: Synthesizing γ-graphyne (Retracted article. See vol. 3, pg. 1312, 2024).png)
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