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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 stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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Engineering MXenes for Thermal and Photothermal Catalysis.

Aicha Anouar1, Amarajothi Dhakshinamoorthy2,3, Feiyan Xu1,4

  • 1Instituto Universitario de Tecnología Química, Consejo Superior de Investigaciones Científicas-Universitat Politecnica de Valencia, Universitat Politecnica de Valencia, Av. De los Naranjos s/n, Valencia 46022, Spain.

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Two-dimensional MXenes, advanced nanomaterials, show great promise as heterogeneous catalysts for thermal and photothermal reactions due to their tunable structures and efficient atom utilization. This review highlights their catalytic applications and future potential.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Heterogeneous catalysis requires advanced materials with defined active sites and high surface areas.
  • Two-dimensional (2D) nanomaterials, like MXenes, offer high atom utilization due to their high aspect ratios and exposed atoms.
  • MXenes, 2D transition-metal carbides and nitrides, have emerged as versatile materials in catalysis.

Purpose of the Study:

  • To review the application of MXenes as solid catalysts in thermal and photothermal reactions.
  • To summarize MXene synthesis, structural characteristics, and active site nature.
  • To discuss best practices for reproducible catalytic performance and highlight representative reactions.

Main Methods:

  • Review of existing literature on MXene synthesis and characterization.
  • Analysis of catalytically active sites, including surface groups, vacancies, and interfaces.
  • Evaluation of MXenes in thermal and photothermal catalytic reactions, focusing on light-to-heat conversion efficiency.

Main Results:

  • MXenes possess tunable structures and well-defined active sites suitable for catalysis.
  • Surface terminations, vacancies, and metal-support interfaces significantly influence catalytic activity.
  • MXenes exhibit high light-to-heat conversion efficiency, beneficial for photothermal catalysis.

Conclusions:

  • MXenes are promising heterogeneous catalysts for thermal and photothermal reactions.
  • Ensuring reproducible and stable catalytic performance requires standardized methodologies and metrics like turnover frequency.
  • Further research into MXene-based catalysis is anticipated to yield rapid advancements.