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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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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...
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Radical Formation: Overview01:03

Radical Formation: Overview

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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...
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Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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Radical Formation: Homolysis00:54

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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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Self-Promoted Hydroxyl Radical Releasing Magnetic Zn@Fe Particles.

Guangshun Yi1,2, Shujun Gao3, Arunmozhiarasi Armugam1

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Small (Weinheim an Der Bergstrasse, Germany)
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Summary
This summary is machine-generated.

This study introduces Zn@Fe core/shell particles that generate hydroxyl radicals without UV light, offering antimicrobial and antiviral properties. The magnetic nanoparticles also enable diverse applications.

Keywords:
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Environmental Science

Background:

  • Semiconductor photocatalysts like TiO2 and ZnO generate hydroxyl radicals but require UV light.
  • UV light dependency limits practical applications of existing photocatalysts.
  • Developing energy-efficient methods for hydroxyl radical generation is crucial.

Purpose of the Study:

  • To develop novel Zn@Fe core/shell particles for hydroxyl radical generation without external energy input.
  • To investigate the antimicrobial and antiviral properties of the synthesized particles.
  • To explore the potential applications arising from the dual functionality of the Zn@Fe particles.

Main Methods:

  • Synthesis of Zn@Fe core/shell particles.
  • Investigation of hydroxyl radical generation mechanism via electron donation and Fenton reaction.
  • Evaluation of antimicrobial and antiviral efficacy.
  • Assessment of magnetic properties.

Main Results:

  • Zn@Fe core/shell particles generate hydroxyl radicals without external energy input.
  • The process involves O2 reduction and Fenton reaction catalyzed by Fe.
  • The particles exhibit significant antimicrobial and antiviral properties.
  • The incorporated Fe provides magnetic properties to the material.

Conclusions:

  • Zn@Fe core/shell particles offer a novel, energy-efficient route for hydroxyl radical generation.
  • The dual functionality (antimicrobial/antiviral and magnetic) expands potential applications.
  • This approach overcomes limitations of traditional UV-dependent photocatalysts.