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Related Concept Videos

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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.
Selection Rules: Photochemical Activation
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Photoelectric Effect02:26

Photoelectric Effect

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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Photoluminescence: Applications01:14

Photoluminescence: Applications

1.0K
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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The Photochemical Reaction Center01:29

The Photochemical Reaction Center

5.3K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Related Experiment Video

Updated: Jan 17, 2026

Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications
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Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications

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COF-Based S-Scheme Heterojunction Photocatalyst.

Xinhe Wu1,2, Mahmoud Sayed2, Guohong Wang1

  • 1Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi, 435002, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|September 19, 2025
PubMed
Summary

Covalent organic frameworks (COFs) can be engineered into S-scheme heterojunctions to improve solar energy conversion by reducing electron-hole recombination. This review explores their design, fabrication, and applications in sustainable fuel production and environmental cleanup.

Keywords:
S‐schemecovalent organic frameworksheterojunctionphotocatalysis

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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Area of Science:

  • Materials Science
  • Photocatalysis
  • Nanotechnology

Background:

  • Semiconductor photocatalysis offers a sustainable energy solution but suffers from inefficient charge carrier separation.
  • Covalent organic frameworks (COFs) show promise for photocatalysis due to their tunable structures, but intrinsic charge recombination limits their performance.

Purpose of the Study:

  • To review the development and significance of S-scheme heterojunctions for enhancing photocatalytic efficiency.
  • To summarize the design, synthesis, and fabrication of COF-based S-scheme heterojunctions.
  • To highlight advanced characterization techniques for understanding charge migration and explore applications.

Main Methods:

  • Systematic review of literature on S-scheme heterojunctions and COFs.
  • Discussion of design principles, synthetic strategies, and fabrication methods for COF-based S-scheme heterojunctions.
  • Overview of characterization techniques and application case studies.

Main Results:

  • S-scheme heterojunctions effectively promote charge separation in photocatalysts while preserving redox potential.
  • COF-based S-scheme heterojunctions demonstrate significant potential in hydrogen evolution, CO2 reduction, and environmental remediation.
  • Advanced characterization confirms efficient charge transfer pathways in these heterostructures.

Conclusions:

  • COF-based S-scheme heterojunctions represent a powerful strategy to overcome charge recombination limitations in photocatalysis.
  • Continued innovation in design, synthesis, and application is crucial for realizing the full potential of these advanced materials.
  • This review provides a roadmap for future research in high-performance photocatalytic systems.