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Related Concept Videos

Radical Formation: Addition00:47

Radical Formation: Addition

1.6K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.6K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.0K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.0K
Radical Formation: Overview01:03

Radical Formation: Overview

2.0K
A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
2.0K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

821
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
821
Radical Oxidation of Allylic and Benzylic Alcohols01:21

Radical Oxidation of Allylic and Benzylic Alcohols

1.9K
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...
1.9K
Colors and Magnetism03:02

Colors and Magnetism

11.4K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Site-Specific Spin State Modulation in Spinel Oxides for Enhanced Nonradical Oxidation.

Jingdan Shi1, Yaxin Cheng1, Ting Wang1

  • 1College of the Environment & Ecology, Fujian Key Laboratory of Coastal Pollution Prevention and Control, Xiamen University, Xiamen, 361102, P.R. China.

Angewandte Chemie (International Ed. in English)
|May 5, 2025
PubMed
Summary

Spinel oxides like MnxCo3-xO4 boost advanced oxidation processes by tuning spin states for enhanced periodate activation and contaminant degradation. This spin-state engineering improves catalytic efficiency and reaction rates.

Keywords:
Advanced oxidationPeriodate activationSite occupationSpin modulationSpinel oxide

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Area of Science:

  • Materials Science
  • Catalysis
  • Environmental Chemistry

Background:

  • Spinel oxides show promise for advanced oxidation processes (AOPs).
  • The mechanism for maximizing spinel oxide activity in AOPs is not fully understood.
  • Controlling electronic structure is key to enhancing catalytic performance.

Purpose of the Study:

  • To investigate the role of spin states in MnxCo3-xO4 for periodate activation.
  • To elucidate the mechanism of enhanced catalytic activity through spin state modulation.
  • To optimize spinel oxide catalysts for efficient contaminant degradation.

Main Methods:

  • Experimental synthesis and characterization of MnxCo3-xO4.
  • Density Functional Theory (DFT) calculations to analyze electronic structure and spin states.
  • Catalytic performance testing for ciprofloxacin degradation using periodate activation.

Main Results:

  • Spin alignment at tetrahedral and octahedral sites facilitates quantum spin exchange interactions (QSEI) and charge transfer.
  • Engineered high spin configuration in CoMn2O4 enhances periodate activation and surface complex formation.
  • CoMn2O4 exhibited a 2.5-fold increase in reaction kinetics compared to MnCo2O4 and up to 22-fold compared to other catalysts.

Conclusions:

  • Site-specific spin state modulation in spinel oxides is a viable strategy to enhance catalytic activity.
  • Understanding and controlling spin states can lead to highly efficient catalysts for environmental remediation.
  • The findings offer insights for designing next-generation spinel oxide catalysts for AOPs.