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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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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:
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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.
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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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Sequential Codoping Making Nonconjugated Organic Radicals Conduct Ionically Electronically.

Yerin Jo1,2, Ilhwan Yu1,3, Jaehyoung Ko1,4

  • 1Institute of Advanced Composite Materials Korea Institute of Science and Technology (KIST) 92 Chudong-ro Bongdong-eup Wanju-gun Jeonbuk 55324 Republic of Korea.

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Summary
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Researchers explored mixed conduction in small molecular organic radicals, achieving conductivity of 10^-4 S/cm. This study paves the way for advanced organic electronics and batteries.

Keywords:
codopingmixed ionic–electronic conductororganic radical molecules

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Electrochemistry

Background:

  • Mixed ionic-electronic conduction in organic radicals is key for organic electronics.
  • Research has focused on polymers, with less attention on small molecular systems.

Purpose of the Study:

  • Investigate mixed conduction in a small molecular organic radical system.
  • Explore the potential of 4-hydroxy TEMPO (HT) for enhanced conductivity.

Main Methods:

  • Sequential codoping of HT with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ).
  • Systematic analysis of doping effects on physical properties and conductivity.

Main Results:

  • Maximum conductivity of approximately 10^-4 S/cm achieved in a HT/LiTFSI/F4TCNQ mixture.
  • Component coupling significantly influences total conductivity.

Conclusions:

  • Established a foundation for studying mixed conduction in small molecular organic radicals.
  • Findings support the development of next-generation organic electronic devices and batteries.