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Related Concept Videos

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Covalent organic framework-based heterojunction photocatalysts.

Jingzhao Cheng1,2, Wang Wang1,2, Shaowen Cao1,2

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.

National Science Review
|December 24, 2025
PubMed
Summary

Covalent organic framework (COF)-based heterojunctions enhance photocatalysis by improving charge separation and light absorption. These advanced materials offer a promising solution for sustainable solar energy conversion, addressing environmental pollution and energy demands.

Keywords:
covalent organic frameworkheterojunctionphotocatalysissolar-to-energy conversion

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Sustainable Energy

Background:

  • Photocatalysis converts solar energy to chemical energy but suffers from charge recombination.
  • Heterojunctions effectively suppress charge recombination in photocatalysts.
  • Covalent organic frameworks (COFs) offer tunable structures and porosity for advanced photocatalyst design.

Purpose of the Study:

  • To review the progress of COF-based heterojunction photocatalysts.
  • To summarize their mechanisms, classifications, synthesis, and applications.
  • To highlight structure-activity relationships and synergistic effects.

Main Methods:

  • Literature review of COF-based heterojunction photocatalysts.
  • Analysis of charge transfer mechanisms and synergistic effects.
  • Examination of structure-activity relationships.

Main Results:

  • COF-based heterojunctions significantly improve charge separation and light harvesting.
  • These materials demonstrate enhanced photocatalytic activity for solar energy conversion.
  • Various synthetic strategies enable tailored COF heterojunctions for specific applications.

Conclusions:

  • COF-based heterojunctions are highly promising for efficient solar-to-energy conversion.
  • Further research into their mechanisms and synthesis will drive advancements.
  • These materials offer a sustainable solution for environmental and energy challenges.