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<p>To&#xa0;enhance the fluorescence properties of covalent organic frameworks (COFs) for broader applications, we introduce flexibility-rigidity alternately assembled red fluorescent COFs, named COF-MA. Its uniquely wide layer spacing (7.054&#xa0;Å) significantly reduces π-π stacking interactions, suppressing fluorescence self-quenching and boosting solid-state emission. With long excitation and emission wavelengths, COF-MA exhibits minimal background interference, enabling highly sensitive detection of rifampicin (RFP) and rifapentine (RPT) in complex biological samples; the detection limits for both are 6.7&#xa0;ng·mL<sup>−1</sup>. Combining experimental studies and computational simulations, we elucidated the fluorescence quenching mechanism. Furthermore, COF-MA-based fluorescent powder enabled rapid, high-contrast visualization of latent fingerprints on eight different substrates. This work not only proposes a novel structure-tuning strategy to improve COF fluorescence, but also delivers a stable probe for antibiotic detection and a versatile forensic tool, significantly expanding the practical scope of fluorescent COFs.</p> Graphical Abstract <p></p>

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Fabrication of flexibility-rigidity alternately assembled solid-state luminescence covalent organic frameworks: application to rifampicin antibiotics detection and latent fingerprint recognition

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Qiuyi Liu,
  • Lingling Li,
  • Min Wang,
  • Mingyue Wang,
  • Yue Lan,
  • Fan Li,
  • Jiaqi Hu,
  • Yuqiang Xiao,
  • Xiurong Guo,
  • Dandan Wang,
  • Die Gao

摘要

To enhance the fluorescence properties of covalent organic frameworks (COFs) for broader applications, we introduce flexibility-rigidity alternately assembled red fluorescent COFs, named COF-MA. Its uniquely wide layer spacing (7.054 Å) significantly reduces π-π stacking interactions, suppressing fluorescence self-quenching and boosting solid-state emission. With long excitation and emission wavelengths, COF-MA exhibits minimal background interference, enabling highly sensitive detection of rifampicin (RFP) and rifapentine (RPT) in complex biological samples; the detection limits for both are 6.7 ng·mL−1. Combining experimental studies and computational simulations, we elucidated the fluorescence quenching mechanism. Furthermore, COF-MA-based fluorescent powder enabled rapid, high-contrast visualization of latent fingerprints on eight different substrates. This work not only proposes a novel structure-tuning strategy to improve COF fluorescence, but also delivers a stable probe for antibiotic detection and a versatile forensic tool, significantly expanding the practical scope of fluorescent COFs.

Graphical Abstract