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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 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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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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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...
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Microbes and Other Elemental Cycles01:24

Microbes and Other Elemental Cycles

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Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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A pentanuclear iron catalyst designed for water oxidation.

Masaya Okamura1,2, Mio Kondo1,2,3,4, Reiko Kuga1

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Researchers developed a new pentanuclear iron complex for efficient water oxidation catalysis. This catalyst shows significantly higher activity and robustness than previous iron-based systems, advancing synthetic fuel production.

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Area of Science:

  • Catalysis
  • Materials Science
  • Renewable Energy

Background:

  • Water oxidation is key for synthetic fuel production but remains a bottleneck.
  • Iron is an abundant, inexpensive, and environmentally benign metal for catalyst development.
  • Previous mononuclear iron catalysts for water oxidation showed low activity and stability.

Purpose of the Study:

  • To develop a highly active and robust iron-based water oxidation catalyst.
  • To investigate the mechanism and redox properties of polynuclear iron complexes for water oxidation.

Main Methods:

  • Synthesis and characterization of a pentanuclear iron complex.
  • Electrochemical analysis to determine redox states and catalytic activity.
  • Quantum chemistry calculations to understand the reaction mechanism.

Main Results:

  • The pentanuclear iron complex achieved a turnover frequency of 1,900 s⁻¹, three orders of magnitude higher than other iron catalysts.
  • The catalyst exhibited redox flexibility with six oxidation states, with the Fe(III)5 state being active for water oxidation.
  • Quantum chemistry revealed a low reaction barrier for O-O bond formation due to adjacent active sites.

Conclusions:

  • Polynuclear iron complexes with redox flexibility and adjacent active sites can efficiently catalyze water oxidation.
  • This work demonstrates the potential of iron-based catalysts for artificial photosynthesis and solar fuel production.
  • Further optimization is needed to address limitations such as high overpotential and water-rich solution operation.