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Related Concept Videos

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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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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...
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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

12.6K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.8K
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...
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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Visible-light-driven hydrogen evolution using a polyoxometalate-based copper molecular catalyst.

Yuan-Sheng Ding1, Hui-Ying Wang, Yong Ding

  • 1School of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin, Jilin 132022, P.R. China. chxu1970@163.com.

Dalton Transactions (Cambridge, England : 2003)
|February 27, 2020
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Summary
This summary is machine-generated.

This study introduces a novel polyoxometalate-based copper cluster as an effective catalyst for hydrogen evolution. The catalyst demonstrates high stability and efficiency in visible-light-driven reactions.

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Area of Science:

  • Materials Science
  • Catalysis
  • Photochemistry

Background:

  • Polyoxometalates (POMs) are versatile inorganic clusters with tunable properties.
  • Developing efficient and stable molecular catalysts for hydrogen evolution is crucial for renewable energy.
  • Copper-based POMs for hydrogen evolution catalysis are underexplored.

Purpose of the Study:

  • To synthesize and characterize a novel polyoxometalate-based copper cluster.
  • To evaluate its performance as a molecular catalyst for visible-light-driven hydrogen evolution.
  • To assess the stability of the catalyst under photocatalytic conditions.

Main Methods:

  • Synthesis and structural characterization of the copper-POM cluster.
  • Photocatalytic hydrogen evolution experiments under visible light irradiation.
  • Stability testing through repeated catalytic cycles and characterization.

Main Results:

  • A novel polyoxometalate-based copper cluster, [Cu5(OH)4(H2O)2(A-α-SiW9O33)2]10- (1), was successfully synthesized.
  • Compound 1 exhibited effective molecular catalysis for visible-light-driven H2 evolution.
  • A high turnover number (TON) of 718.9 was achieved, with the catalyst maintaining structural integrity.

Conclusions:

  • The synthesized copper-POM cluster is a promising and stable catalyst for hydrogen evolution.
  • This work expands the scope of POMs in catalytic applications for sustainable energy.
  • The catalyst's stability and efficiency highlight its potential for practical applications.