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Related Concept Videos

Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.1K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
4.1K
Radical Formation: Overview01:03

Radical Formation: Overview

1.9K
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...
1.9K
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

2.2K
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...
2.2K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

1.7K
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.
Along with electronic...
1.7K
π Molecular Orbitals of the Allyl Radical01:27

π Molecular Orbitals of the Allyl Radical

2.9K
Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
The allyl systems have identical molecular orbitals but differ in the number of π...
2.9K

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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Viridium: A Stable Radical and Its π-Dimerization.

Henri-Pierre Jacquot de Rouville1, Christophe Gourlaouen1, David Bardelang2

  • 1Institut de Chimie de Strasbourg, CNRS UMR 7177, Université de Strasbourg, 4, rue Blaise Pascal, Strasbourg 67000, France.

Journal of the American Chemical Society
|January 15, 2025
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Summary
This summary is machine-generated.

Researchers discovered a stable organic radical using light-mediated reactions. This unique aromatic radical exhibits amphoteric redox behavior and π-dimerization, with its properties studied in water and perfluorohexane.

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Area of Science:

  • Photochemistry
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Stable organic radicals are valuable in various chemical applications.
  • Controlling radical formation under mild conditions is a significant challenge.
  • Acridinium-based compounds offer potential for novel radical chemistry.

Purpose of the Study:

  • To report the discovery and characterization of a novel stable organic radical.
  • To elucidate the photochemical mechanism of its formation.
  • To investigate its unique redox and π-dimerization properties in different solvent environments.

Main Methods:

  • Light-mediated synthesis under mild conditions.
  • Single-crystal X-ray diffraction for structural determination.
  • Spectroscopic techniques (EPR, UV/vis, NMR) for characterization.
  • Photophysical experiments and theoretical calculations for mechanism elucidation.
  • Thermodynamic studies of π-dimerization in water and perfluorohexane.

Main Results:

  • A stable acridinium-based organic radical was successfully synthesized.
  • The radical's structure was unambiguously confirmed by multiple analytical methods.
  • The photochemical formation mechanism was elucidated.
  • Amphoteric redox behavior and π-dimerization capabilities were demonstrated.
  • Solvophobic effects on π-dimer thermodynamics in perfluorocarbons were investigated.

Conclusions:

  • The discovery provides a new stable organic radical accessible via photochemistry.
  • The radical's unique properties, including π-dimerization, open avenues for new applications.
  • Understanding solvophobic effects in perfluorocarbons is crucial for designing future systems.