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Related Concept Videos

Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Catalysis02:50

Catalysis

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.
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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
Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
Photoluminescence: Applications01:14

Photoluminescence: Applications

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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CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
07:08

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

Published on: June 12, 2019

Artificial light-gated catalyst systems.

Ragnar S Stoll1, Stefan Hecht

  • 1Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany.

Angewandte Chemie (International Ed. in English)
|August 17, 2010
PubMed
Summary
This summary is machine-generated.

Chemists are developing light-gated catalysts for precise control over chemical reactions. These photocontrolled systems offer enhanced selectivity and activity, opening new application avenues.

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Area of Science:

  • Catalysis
  • Photochemistry
  • Materials Science

Background:

  • Catalyst design has evolved to incorporate control elements for enhanced functionality.
  • Light serves as an attractive stimulus for precise control over chemical processes.
  • Nature utilizes light-based control in biological systems like vision.

Purpose of the Study:

  • To review the concept and applications of light-gated catalysis.
  • To discuss photocaged and photoswitchable catalyst systems.
  • To highlight the potential of artificial photocontrolled catalysts.

Main Methods:

  • Review of existing literature on light-gated catalysis.
  • Analysis of photocaged and photoswitchable catalyst designs.
  • Discussion of examples demonstrating spatial and temporal control.

Main Results:

  • Light can induce activity and selectivity in catalyst systems with high precision.
  • Photocontrolled catalysts enable signal localization, amplification, and chemical action.
  • Artificial systems mimic natural light-driven processes.

Conclusions:

  • Light-gated catalysis offers significant opportunities for future applications.
  • Photocontrolled systems provide advanced control over chemical reactions.
  • This approach allows for precise manipulation of catalytic processes using light.