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Related Concept Videos

Catalysis02:50

Catalysis

30.8K
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.
30.8K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.9K
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...
3.9K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

14.4K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
14.4K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

6.0K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
6.0K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.1K
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.
3.1K

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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Development of a framework catalyst for photocatalytic hydrogen evolution.

Pondchanok Chinapang1, Masaya Okamura, Takahiro Itoh

  • 1Institute for Molecular Science, Higashiyama 5-1, Myodaiji, Okazaki, Aichi 444-8787, Japan. mio@ims.ac.jp masaoka@ims.ac.jp.

Chemical Communications (Cambridge, England)
|December 7, 2017
PubMed
Summary
This summary is machine-generated.

A novel heterogeneous framework catalyst (FC-1) was created using Rh(ii) paddle-wheel dimers. This catalyst shows sustained activity for photocatalytic hydrogen production from water and is reusable without significant performance loss.

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Area of Science:

  • Materials Science
  • Catalysis
  • Photochemistry

Background:

  • Developing efficient and reusable catalysts is crucial for sustainable chemical processes.
  • Heterogeneous catalysts offer advantages in separation and reusability compared to homogeneous counterparts.
  • Photocatalytic water splitting for hydrogen production is a key area in renewable energy research.

Purpose of the Study:

  • To synthesize a novel heterogeneous framework catalyst (FC-1) with controlled self-assembly.
  • To investigate the catalytic activity of FC-1 for photocatalytic hydrogen production from water.
  • To evaluate the stability and reusability of the developed framework catalyst.

Main Methods:

  • Controlled self-assembly of Rh(ii) paddle-wheel dimers functionalized with 1,8-naphthalimide moieties.
  • Characterization of the resulting heterogeneous framework catalyst (FC-1).
  • Testing the photocatalytic activity for hydrogen evolution from water under irradiation.

Main Results:

  • Successful formation of a novel heterogeneous framework catalyst (FC-1) via self-assembly.
  • FC-1 demonstrated long-lived catalytic activity for photocatalytic hydrogen production.
  • The catalyst was easily recovered and reused with minimal loss of activity.

Conclusions:

  • The developed heterogeneous framework catalyst (FC-1) is effective for sustainable hydrogen production.
  • The catalyst's stability and reusability make it a promising candidate for practical applications.
  • Controlled self-assembly provides a viable route to engineer advanced catalytic materials.