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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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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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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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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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Updated: Nov 19, 2025

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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Single-Atom Photocatalysts for Emerging Reactions.

Bingquan Xia1, Yanzhao Zhang1, Jingrun Ran1

  • 1School of Chemical Engineering & Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia.

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|February 3, 2021
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Single-atom photocatalysts offer a sustainable route to produce valuable chemicals and fuels using solar energy. Their unique structure enhances activity, selectivity, and stability for emerging reactions.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Sustainable Chemistry

Background:

  • Single-atom photocatalysts (SAPs) utilize solar energy for chemical synthesis, addressing fossil fuel dependency.
  • SAPs offer high activity, selectivity, and stability due to unique electronic structures and dispersed active sites.
  • Atomic dispersion in SAPs aids in understanding reaction mechanisms and structure-performance relationships.

Purpose of the Study:

  • To review the design and fabrication of SAPs for emerging chemical and fuel production reactions.
  • To discuss SAPs in reduction, oxidation, and redox reactions.
  • To explore structure-activity relationships and reaction mechanisms in SAPs.

Main Methods:

  • Literature review and synthesis of existing research on single-atom photocatalysts.
  • Analysis of SAPs' compositional and structural effects on catalytic performance.
  • Discussion of reaction mechanisms and structure-performance correlations.

Main Results:

  • SAPs demonstrate high efficiency, selectivity, and stability in various novel reactions beyond traditional H2 production, N2 fixation, and CO2 conversion.
  • Detailed explanations of the relationships between SAP composition/structure and their performance are provided.
  • Insightful analysis of reaction mechanisms facilitated by single-atom active sites.

Conclusions:

  • SAPs are promising for sustainable chemical and fuel production via solar energy.
  • Further research into SAP design and fabrication can lead to high-performance catalysts for emerging reactions.
  • Understanding SAPs' structure-performance relationships is key to advancing photocatalysis.