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Related Concept Videos

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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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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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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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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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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Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications
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Atomically Precise Cluster Cocatalysts: Missing Link toward Heterogenized Photocatalytic Systems.

Stephen Nagaraju Myakala1, Alexey Cherevan1

  • 1Institute of Materials Chemistry, TU Wien, Getreidemarkt 9/BC/02, Vienna 1060, Austria.

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|December 19, 2025
PubMed
Summary

Atomically precise clusters are emerging as advanced cocatalysts for solar fuel production. Their defined structures offer superior control and stability over traditional catalysts, enabling efficient photocatalysis.

Keywords:
CO2 reductioncocatalysthydrogen evolution reactionnanoclusterpolyoxometalatesecondary building unitstructure−activity relationshipsurface anchoringthiometalatewater splitting

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Area of Science:

  • Materials Science
  • Catalysis
  • Renewable Energy

Background:

  • Nanoparticles and molecular complexes have limitations in photocatalysis due to imprecise structures and stability issues.
  • Atomically precise clusters offer a unique bridge between homogeneous precision and heterogeneous robustness.
  • These clusters possess well-defined multinuclear architectures for precise active site control.

Purpose of the Study:

  • To critically review the role of atomically precise clusters (oxide, sulfide, metallic) as cocatalysts in photocatalytic solar fuel production.
  • To highlight the advantages of clusters over nanoparticles and molecular complexes.
  • To discuss surface-anchoring strategies and mechanistic insights.

Main Methods:

  • Review of recent experimental developments in cluster synthesis and application.
  • Analysis of surface-anchoring techniques for cluster immobilization.
  • Examination of mechanistic studies enabled by cluster systems.

Main Results:

  • Atomically precise clusters provide tunable compositions and structures for enhanced photocatalytic activity.
  • Clusters exhibit improved stability and engage in multielectron redox processes crucial for solar fuel generation.
  • Well-defined active sites facilitate systematic structure-activity relationship studies.

Conclusions:

  • Cluster-based cocatalysts represent a transformative approach to engineering efficient and selective photocatalysts.
  • Further research is needed to overcome current challenges and realize their full potential in solar fuel production.
  • Precise control over cluster structure is key to purposeful catalyst design for light-driven fuel generation.