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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.
Radical Autoxidation01:20

Radical Autoxidation

The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
Preparation of Alcohols via Addition Reactions02:15

Preparation of Alcohols via Addition Reactions

Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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.
Radical Oxidation of Allylic and Benzylic Alcohols01:21

Radical Oxidation of Allylic and Benzylic Alcohols

Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...

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Nonaqueous catalytic water oxidation.

Zuofeng Chen1, Javier J Concepcion, Hanlin Luo

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.

Journal of the American Chemical Society
|November 25, 2010
PubMed
Summary

Ruthenium complexes catalyze water oxidation efficiently in organic solvents like TFE. Adding water as a limiting reagent significantly boosts catalytic rates, revealing new reaction pathways dependent on water and acetate concentration.

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Area of Science:

  • Inorganic Chemistry
  • Electrochemistry
  • Catalysis

Background:

  • Water oxidation is crucial for renewable energy technologies.
  • Developing efficient and stable water oxidation catalysts (WOCs) is a key challenge.
  • Ruthenium complexes are promising WOC candidates.

Purpose of the Study:

  • To investigate the catalytic activity of [Ru(Mebimpy)(bpy)(OH2)]2+ and its derivative for water oxidation.
  • To explore the influence of organic solvents and water concentration on catalytic performance.
  • To elucidate the reaction mechanism of water oxidation.

Main Methods:

  • Electrochemical studies of ruthenium complexes immobilized on oxide electrodes.
  • Varying water concentration as a limiting reagent in organic solvents (propylene carbonate, TFE).
  • Kinetic analysis to determine reaction orders.

Main Results:

  • The ruthenium complexes demonstrated significant water oxidation catalytic activity in organic solvents.
  • Water oxidation rates were greatly enhanced when water was used as a limiting reagent compared to water as a solvent.
  • A reaction pathway first-order in H2O was identified.
  • An additional pathway first-order in acetate emerged when using TFE as a solvent.

Conclusions:

  • Ruthenium complexes can effectively catalyze water oxidation in non-aqueous media.
  • Controlling water concentration is critical for optimizing catalytic efficiency.
  • The solvent choice influences the water oxidation mechanism, introducing acetate-dependent pathways.