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Related Concept Videos

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.
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Catalysis02:50

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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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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 contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Thermal Electrocyclic Reactions: Stereochemistry01:17

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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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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.
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Electron transfer in heterojunction catalysts.

Jianhua Zhang1, Yuan Lin1, Lijun Liu1

  • 1Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, P. R. China. liulj@wtu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
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PubMed
Summary
This summary is machine-generated.

Electron transfer (ET) in heterojunction catalysis is key to improving efficiency for energy and environmental solutions. This perspective reviews ET

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Area of Science:

  • Heterojunction catalysis
  • Electron transfer mechanisms
  • Sustainable chemistry

Background:

  • Heterojunction catalysis is vital for addressing energy and environmental challenges.
  • Electron transfer (ET) at interfaces significantly enhances catalytic efficiency.
  • Tuning electronic structures and internal electric fields are key benefits of ET.

Purpose of the Study:

  • To review recent advancements in catalysis involving electron transfer in heterojunction catalysts.
  • To highlight the critical role of ET in catalytic mechanisms.
  • To discuss the occurrence, driving forces, and applications of ET in this field.

Main Methods:

  • Summarization of recent progress in heterojunction catalysis research.
  • Introduction of common techniques for corroborating ET processes and their measurement principles.
  • Perspective-based analysis of existing literature.

Main Results:

  • Electron transfer (ET) is a ubiquitous and crucial phenomenon in heterojunction catalysis.
  • ET enables tuning of electronic structures and creation of internal electric fields, boosting catalytic performance.
  • Various techniques exist to measure and confirm ET processes in catalytic systems.

Conclusions:

  • Electron transfer plays a pivotal role in the mechanism of heterojunction catalysts.
  • Understanding and controlling ET is essential for developing efficient catalytic solutions.
  • Future research should address current limitations and explore new challenges in ET for catalysis.