Formation of Curvature Subunit of Carbon in Combustion

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• 作者：Xin-Zhou Wu ; Yang-Rong Yao ; Miao-Miao Chen ; Han-Rui Tian ; Jun Xiao ; Yun-Yan Xu ; Min-Song Lin ; Laura Abella ; Cheng-Bo Tian ; Cong-Li Gao ; Qianyan Zhang ; Su-Yuan Xie ; Rong-Bin Huang ; Lan-Sun Zheng
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：August 3, 2016
• 年：2016
• 卷：138
• 期：30
• 页码：9629-9633
• 全文大小：385K
• 年卷期：0
• ISSN：1520-5126

文摘

Curvature prevalently exists in the world of carbon materials (e.g., fullerenes, buckyl bowls, carbon nanotubes, and onions), but traditional C2-addition mechanisms fail to elucidate the mechanism responsible for the formation of carbon curvature starting from a pentagonal carbon ring in currently available chemical-physical processes such as combustion. Here, we show a complete series of nascent pentagon-incorporating C₅–C₁₈ that are online produced in the flame of acetylene–cyclopentadiene–oxygen and in situ captured by C₆₀ or trapped as polycyclic aromatic hydrocarbons for clarifying the growth of the curved subunit of C₂₀H₁₀. A mechanism regarding C1-substitution and C2-addition has been proposed for understanding the formation of curvature in carbon materials, as exemplified by the typical curved molecule containing a single pentagon completely surrounded by five hexagons. The present mechanism, supported by the intermediates characterized by X-ray crystallography as well as NMR, has been experimentally validated for the rational synthesis of curved molecule in the commercially useful combustion process.