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Related Concept Videos

Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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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 Formation: Overview01:03

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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:
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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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Radical Formation: Abstraction00:47

Radical Formation: Abstraction

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The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Molecular Dynamics in Ionic Liquid/Radical Systems.

Bulat Gizatullin1, Carlos Mattea1, Siegfried Stapf1

  • 1FG Technische Physik II/Polymerphysik, Technische Universität Ilmenau, D-98684 Ilmenau, Germany.

The Journal of Physical Chemistry. B
|April 30, 2021
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Summary
This summary is machine-generated.

This study investigates the molecular dynamics of ionic liquids interacting with stable organic radicals using NMR and DNP. Findings reveal distinct interaction mechanisms influencing ion-radical dynamics and molecular motion.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Ionic liquids (ILs) exhibit complex dynamics, especially when interacting with stable organic radicals.
  • Understanding these ion-radical interactions is crucial for predicting and controlling system properties.
  • Dynamic Nuclear Polarization (DNP) enhances Nuclear Magnetic Resonance (NMR) signals via mechanisms like Overhauser and solid effects.

Purpose of the Study:

  • To elucidate the molecular dynamics of 1-ethyl-3-methylimidazolium bis(trifluoromethyl sulfonyl)imide (Emim-Tf2N) in the presence of four stable organic radicals (TEMPO, 4-benzoyloxy-TEMPO, BDPA, DPPH).
  • To differentiate interaction mechanisms (Overhauser effect, solid effect) based on radical properties and their influence on ion-radical dynamics.
  • To analyze the contributions of rotational and translational motion to NMR relaxation dispersion.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy combined with Dynamic Nuclear Polarization (DNP).
  • Electron Paramagnetic Resonance (EPR) spectroscopy.
  • NMR relaxation dispersion analysis on 1H and 19F nuclei within the ionic liquid cation and anion.

Main Results:

  • Distinct interaction processes, Overhauser and solid effects, were identified, driven by dipolar or scalar interactions.
  • The size and chemical nature of the radical dictate the dominant interaction mechanism.
  • Rotational and translational contributions to NMR relaxation dispersion were decomposed, yielding correlation times for motion and interactions.

Conclusions:

  • The study provides a detailed molecular-level understanding of ion-radical interactions in ionic liquids.
  • Correlation times of molecular motion and interactions can be determined by analyzing NMR relaxation dispersion.
  • Electron relaxation time and electron-nuclear spin hyperfine coupling significantly influence the observed dynamics.