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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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A diarsene radical anion.

Grégoire Sieg1, Malte Fischer2,3, Fabian Dankert2,4

  • 1Chemistry Department, Philipps-University, Hans-Meerwein-Str. 4, 35043 Marburg, Germany. gunnar.werncke@chemie.uni-marburg.de.

Chemical Communications (Cambridge, England)
|August 16, 2022
PubMed
Summary
This summary is machine-generated.

Researchers isolated the first diarsene radical anion, a molecule with unpaired electrons. Characterization revealed spin density in a π*-orbital, and reactivity studies showed it acts as a reducing agent.

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Area of Science:

  • Organometallic chemistry
  • Inorganic chemistry
  • Radical chemistry

Background:

  • Diarsenes are compounds containing a direct arsenic-arsenic bond.
  • Radical anions are species with an unpaired electron and a net negative charge.
  • Understanding the electronic structure and reactivity of novel arsenic compounds is crucial for developing new chemical transformations.

Purpose of the Study:

  • To report the first isolation and characterization of a diarsene radical anion.
  • To investigate the electronic structure and bonding in the diarsene radical anion.
  • To explore the reactivity of the diarsene radical anion.

Main Methods:

  • Reduction of a neutral diarsene precursor.
  • Comprehensive characterization techniques (e.g., spectroscopy, X-ray crystallography).
  • Density Functional Theory (DFT) calculations.

Main Results:

  • Successful isolation of the first diarsene radical anion.
  • Unpaired spin density located in the antibonding π*-orbital, involving terphenyl ligands.
  • Reactivity studies indicate reducing properties rather than pronounced radical behavior.

Conclusions:

  • The diarsene radical anion is a stable species with unique electronic properties.
  • The terphenyl ligands play a significant role in stabilizing the radical anion.
  • The compound functions primarily as a reducing agent, opening avenues for its application in synthesis.