Towards Oxygen-stable Vinylene-linked Covalent Organic Frameworks: Mitigating Photobleaching for Enhanced Photostability

Zi-Han Zhu; Jia Guo

doi:10.1007/s10118-026-3598-5

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Towards Oxygen-stable Vinylene-linked Covalent Organic Frameworks: Mitigating Photobleaching for Enhanced Photostability

RESEARCH ARTICLE | Updated：2026-03-13

- Towards Oxygen-stable Vinylene-linked Covalent Organic Frameworks: Mitigating Photobleaching for Enhanced Photostability
- Chinese Journal of Polymer Science Vol. 44, Pages: 1-10(2026)
- Affiliations：
  
  State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
- Author bio：
  
  guojia@fudan.edu.cn
- Funds：
- DOI：10.1007/s10118-026-3598-5
  CLC：
- Received：21 December 2025，
  
  Revised：2026-01-26，
  
  Accepted：27 January 2026，
  
  Online First：13 March 2026，
  
  Published：2026-02
- Accepted：
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Zhu, Z. H.; Guo, J. Towards oxygen-stable vinylene-linked covalent organic frameworks: mitigating photobleaching for enhanced photostability. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-026-3598-5

Zi-Han Zhu, Jia Guo. Towards Oxygen-stable Vinylene-linked Covalent Organic Frameworks: Mitigating Photobleaching for Enhanced Photostability[J/OL]. Chinese Journal of Polymer Science, 2026, 441-10.
Zhu, Z. H.; Guo, J. Towards oxygen-stable vinylene-linked covalent organic frameworks: mitigating photobleaching for enhanced photostability. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-026-3598-5 DOI：

Zi-Han Zhu, Jia Guo. Towards Oxygen-stable Vinylene-linked Covalent Organic Frameworks: Mitigating Photobleaching for Enhanced Photostability[J/OL]. Chinese Journal of Polymer Science, 2026, 441-10. DOI： 10.1007/s10118-026-3598-5.

摘要

Abstract

Conjugated covalent organic fra

meworks (COFs) possess distinct advantages over amorphous organic photocatalysts

including high charge transfer efficiency and effective light utilization. However

their photocatalytic performance often declines under prolonged solar irradiation in air

largely owing to their limited photostability. In this study

we systematically investigated the photobleaching mechanism of vinylene-linked COFs synthesized

via

aldol condensation between 2

6-trimethyl-1

5-triazine and aldehydes. When the COF contains phenylene as the linker

oxygen can undergo photoinduced addition across the vinylene bond

leading to cleavage of the vinylene bonds and the formation of terminal aldehydes

thereby causing photobleaching. Mechanistic studies indicated that superoxide anion radicals play a key role in this oxidative degradation process

accompanied by the partial cycloaddition of adjacent vinylene bonds. To enhance photostability

we incorporated naphthyl groups into the framework at the strut

replacing phenylene to modulate the excited-state electronic structure at the vinylene linkages. The newly synthesized COF exhibited notable anti-photobleaching capability in the presence of oxygen. This work not only deepens the understanding of photodegradation mechanisms in conjugated COFs but also offers valuable insights for the design and application of photostable COF-based catalysts.

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Keywords

references

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