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<p>On-surface synthesis recently enabled access to generate a series of cyclo[<i>n</i>]carbons (C<sub><i>n</i></sub>, up to C<sub>26</sub>) via delicately designed precursors. However, for larger cyclocarbons, synthesis of the corresponding precursors is being challenged. Here, we report another strategy for synthesizing larger cyclocarbons via the coupling and ring-opening reactions from smaller ones. We chose C<sub>10</sub> as the precursor, and induce the coupling and ring-opening reactions via tip manipulation to successfully generate C<sub>20</sub> and C<sub>30</sub>. Bond-resolved atomic force microscopy imaging unambiguously reveals the polyynic structure of C<sub>30</sub>, aligning with theoretical prediction. This approach establishes a new pathway to access larger cyclocarbons, and potentially enables controlled polymerization of cyclocarbons.</p>

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On-surface synthesis of cyclo[20]carbon and cyclo[30]carbon from cyclo[10]carbon

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月13日

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  • Yuan Guo,
  • Yuzhe Yun,
  • Wenzhi Xiang,
  • Guorui Xu,
  • Luye Sun,
  • Wei Xu

摘要

On-surface synthesis recently enabled access to generate a series of cyclo[n]carbons (Cn, up to C26) via delicately designed precursors. However, for larger cyclocarbons, synthesis of the corresponding precursors is being challenged. Here, we report another strategy for synthesizing larger cyclocarbons via the coupling and ring-opening reactions from smaller ones. We chose C10 as the precursor, and induce the coupling and ring-opening reactions via tip manipulation to successfully generate C20 and C30. Bond-resolved atomic force microscopy imaging unambiguously reveals the polyynic structure of C30, aligning with theoretical prediction. This approach establishes a new pathway to access larger cyclocarbons, and potentially enables controlled polymerization of cyclocarbons.