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Polycyclic Aromatic Hydrocarbon Growth by Diradical Cycloaddition/Fragmentation.

A Comandini1, S Abid1, N Chaumeix1

  • 1Institut de Combustion Aérothermique Réactivité et Environnement, INSIS-CNRS , 1C Avenue de la Recherche Scientifique, Orléans 45071 Cedex 2, France.

The Journal of Physical Chemistry. A
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Summary
This summary is machine-generated.

This study generalizes the 1,4-cycloaddition/fragmentation (1,4-CAF) mechanism for polycyclic aromatic hydrocarbon (PAH) formation. It reveals how PAH size and radical site influence reaction energetics, crucial for understanding soot formation in pyrolytic environments.

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Area of Science:

  • Physical Chemistry
  • Theoretical Chemistry
  • Chemical Kinetics

Background:

  • Polycyclic Aromatic Hydrocarbons (PAHs) are key intermediates in soot formation.
  • The 1,4-cycloaddition/fragmentation (1,4-CAF) mechanism is implicated in PAH growth.
  • Generalizing this mechanism to various diradicals and PAHs is essential for a comprehensive understanding.

Purpose of the Study:

  • To investigate the generalization of the 1,4-CAF mechanism to reactions involving diverse diradical compounds and polycyclic aromatic hydrocarbons (PAHs).
  • To explore the energetic landscape of these reactions and identify key factors influencing reaction pathways.
  • To analyze energy barriers for diradical formation and their impact on subsequent reactions.

Main Methods:

  • Quantum chemical calculations using uB3LYP/6-311G(d,p) and composite methods (CBS-QB3, G3(MP2)B3, G3B3).
  • Exploration of potential energy surfaces for reactions between o-benzyne and various PAHs (naphthalene, anthracene, phenanthrene, pyrene).
  • Analysis of energy barriers for multiring diradical formation and Diels-Alder reactions.

Main Results:

  • The 1,4-CAF mechanism is viable for reactions between o-benzyne and larger PAHs, forming anthracene and acetylene.
  • Reaction energetics are significantly influenced by PAH size and the position of reactive carbon atoms.
  • Diradical site position is critical for energy barriers, while size has a lesser effect.

Conclusions:

  • The 1,4-CAF mechanism can be generalized to a wider range of diradical-PAH reactions.
  • Understanding these reaction energetics provides insights into PAH growth and soot formation pathways.
  • Further kinetic analyses are needed to establish general kinetic rules for these complex reactions.