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Related Concept Videos

Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Radical Reactivity: Overview01:11

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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 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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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Radical Reactivity: Electrophilic Radicals01:02

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Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Controlling Competitive Radical Pathways: Insights From Aryl Diazonium Electrografting.

Sara Helis1, Jean Pinson2, Philippe Decorse2

  • 1Univ Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, Angers, France.

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|December 22, 2025
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Summary

This study reveals how nitrobenzene diazonium electrografting creates 2D nanomaterials by controlling aryl and diazenyl radicals. Strategies were developed to tune nanofilm composition for precise control over radical reactivity.

Keywords:
carbon surfacecompetitive radical pathwaysdiazenyl radicaldiazonium electrograftingsurface functionalization

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Controlling radical species reactivity is crucial for chemical processes.
  • Diazonium electrografting is a key method for 2D nanomaterial preparation but needs further understanding.

Purpose of the Study:

  • To elucidate the mechanism of nitrobenzene diazonium electrografting.
  • To understand how this mechanism impacts nanofilm composition.
  • To develop strategies for precise control over film formation.

Main Methods:

  • Utilizing multiphysics simulations to model the electrografting process.
  • Employing radical scavengers and redox inhibitors to control reactivity.
  • Analyzing film composition and radical incorporation.

Main Results:

  • Film growth is determined by competing aryl and diazenyl radicals.
  • Variable amounts of azo-bridged nitrophenyl units are incorporated.
  • Diazneyl radicals preferentially graft at the substrate/film interface.
  • Selective trapping of aryl radicals yields azo-enriched films.

Conclusions:

  • Achieved unprecedented understanding of nitrobenzene diazonium electrografting mechanism.
  • Demonstrated control over nanofilm composition by manipulating radical competition.
  • Opened pathways for precise tuning of film properties and selective radical reactivity.