Scholarlink

<p>Extending the chain lengths of conductive polymers, such as unsubstituted poly(<i>para</i>-phenylene) (PPP), is crucial for their application in high-performance organic devices and processing into high-quality functional materials. While surface-assisted Ullmann coupling has increased PPP chain lengths to ~100 nm, from ~32 nm achieved by solution-based reactions, its step-growth reaction mechanism limits further elongation. Here we report the synthesis of PPP via radical ring-opening polymerization of [6]cyclo(<i>para-</i>phenylene) on a Cu(111) surface. This process has been identified as a chain-growth polymerization, substantially enhancing the PPP chain length to the micrometre range (~0.9 μm). The obtained ultralong PPP chains on an otherwise clean surface undergo selective C–H bond scission, forming an upright-standing poly(<i>para-</i>benzyne) intermediate, which further couples into the unsubstituted biphenylene ribbon with length up to ~40 nm. The ring-opening polymerization provides a versatile route to high-quality polymers and non-benzenoid carbon nanoribbons with precise structural control.</p><p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

On-surface radical ring-opening polymerization produces ultralong poly(para-phenylene) for access to non-benzenoid carbon nanoribbons

  • 期刊论文

  • 发表日期：

    2026年3月16日

查看全文
  • Qitang Fan,
  • Qigang Zhong,
  • Jan-Niclas Luy,
  • Jakob Schramm,
  • Lukas Ruppenthal,
  • Wenhui Leng,
  • Daniel Ebeling,
  • Ralf Tonner-Zech,
  • André Schirmeisen,
  • J.Michael Gottfried

摘要

Extending the chain lengths of conductive polymers, such as unsubstituted poly(para-phenylene) (PPP), is crucial for their application in high-performance organic devices and processing into high-quality functional materials. While surface-assisted Ullmann coupling has increased PPP chain lengths to ~100 nm, from ~32 nm achieved by solution-based reactions, its step-growth reaction mechanism limits further elongation. Here we report the synthesis of PPP via radical ring-opening polymerization of [6]cyclo(para-phenylene) on a Cu(111) surface. This process has been identified as a chain-growth polymerization, substantially enhancing the PPP chain length to the micrometre range (~0.9 μm). The obtained ultralong PPP chains on an otherwise clean surface undergo selective C–H bond scission, forming an upright-standing poly(para-benzyne) intermediate, which further couples into the unsubstituted biphenylene ribbon with length up to ~40 nm. The ring-opening polymerization provides a versatile route to high-quality polymers and non-benzenoid carbon nanoribbons with precise structural control.