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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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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.
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Radical Formation: Abstraction00:47

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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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Radical Reactivity: Steric Effects01:10

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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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Radical Formation: Elimination00:51

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Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions with respect...
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Radical Formation: Overview01:03

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Surface interactions and radical generation in TCD decomposition: a DFT approach.

Samantha E Knoth1, Daniel Tunega2, Adelia J A Aquino3

  • 1Department of Mechanical Engineering, Texas Tech University, Lubbock, TX, 79409, USA.

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|October 27, 2025
PubMed
Summary

Density functional theory reveals exo-tetrahydrodicyclopentadiene (exo-TCD) decomposition is most favorable via R4 hydrogen abstraction. Gamma-alumina surfaces, especially with defects, enhance this reactivity, crucial for advanced propulsion fuels.

Keywords:
Absorption reactionDFTDefected γ-Al2O3 surfaceH-abstractionTCD

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Aerospace Engineering

Background:

  • Exo-tetrahydrodicyclopentadiene (exo-TCD) is a critical component in Jet Propellant-10 (JP-10), a high-density fuel for aerospace applications.
  • Understanding the initial decomposition pathways of exo-TCD is vital, particularly with the addition of aluminum particles to enhance fuel performance.
  • The catalytic role of the γ-Al2O3 surface in exo-TCD decomposition, including surface defect effects, requires detailed investigation.

Purpose of the Study:

  • To investigate the initial hydrogen abstraction reactions in exo-TCD decomposition using density functional theory (DFT).
  • To elucidate the role of the γ-Al2O3 surface, including surface defects, in facilitating exo-TCD decomposition pathways.
  • To identify the most energetically favorable decomposition routes and radical formation processes.

Main Methods:

  • Density functional theory (DFT) calculations employing the Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional with SVP and TZVP basis sets.
  • Utilized the resolution of identity (RI) method for computational efficiency and dispersion correction (D3).
  • Modeled surface defects on γ-Al2O3 by considering the interaction with exo-TCD at five distinct active hydroxyl sites.

Main Results:

  • Hydrogen abstraction from the R4 site of exo-TCD was identified as the most energetically favorable initial decomposition pathway.
  • Complexes formed between exo-TCD and γ-Al2O3 sites were primarily van der Waals interactions, with energies between -11 to -20 kcal/mol.
  • Surface defects on γ-Al2O3 were shown to enhance reactivity, facilitating spontaneous H transfer and lowering activation barriers for H-abstraction.

Conclusions:

  • The R4 site is the primary target for hydrogen abstraction in exo-TCD decomposition.
  • γ-Al2O3 surfaces, particularly those with defects, significantly catalyze exo-TCD decomposition pathways.
  • Findings contribute to a better understanding of propulsion fuel decomposition and the development of advanced energetic materials.