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Related Concept Videos

Radical Formation: Elimination00:51

Radical Formation: Elimination

1.9K
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...
1.9K
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

2.3K
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...
2.3K
Flame Photometry: Overview01:02

Flame Photometry: Overview

930
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
930
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
Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

12.1K
In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday...
12.1K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

2.0K
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...
2.0K

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Related Experiment Video

Updated: Oct 26, 2025

Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
10:04

Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes

Published on: May 26, 2014

13.0K

π-Diradical Aromatic Soot Precursors in Flames.

Jacob W Martin1,2, Laura Pascazio2, Angiras Menon1,2

  • 1Department of Chemical Engineering and Biotechnology, University of Cambridge, CB3 0AS Cambridge, United Kingdom.

Journal of the American Chemical Society
|August 2, 2021
PubMed
Summary
This summary is machine-generated.

Scientists discovered a reactive aromatic soot precursor in flames. This finding explains rapid soot formation and offers targets for reducing harmful emissions from incomplete fuel combustion.

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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

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Related Experiment Videos

Last Updated: Oct 26, 2025

Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
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Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes

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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

Published on: August 5, 2016

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Area of Science:

  • Combustion Science
  • Chemical Physics
  • Materials Science

Background:

  • Soot from incomplete combustion contributes to global warming and disease.
  • Current soot formation mechanisms are limited by slow chemical rates or unstable physical interactions.

Purpose of the Study:

  • To elucidate the unsolved mechanism of soot nanoparticle formation in hydrocarbon flames.
  • To identify key molecular precursors and reaction pathways in soot formation.

Main Methods:

  • Non-contact atomic force microscopy (AFM) was used to image reactive soot precursors.
  • Quantum molecular dynamics (QMD) simulations were employed to model reaction pathways and molecular interactions.
  • Analysis focused on the electronic structure and reactivity of aromatic species.

Main Results:

  • Evidence of a reactive π-diradical aromatic soot precursor was observed.
  • Kekulé aromatic structures with localized π-electrons exhibit a triplet diradical ground state.
  • Barrierless chain reactions between these reactive sites form thermally stable hydrocarbons.
  • QMD simulations showed physical condensation and subsequent chemical cross-linking via internal rotors.

Conclusions:

  • The identified reactive precursor facilitates rapid, thermally stable chain reactions leading to soot formation.
  • This mechanism overcomes limitations of purely chemical or physical growth models.
  • These findings provide molecular targets for mitigating toxic soot emissions.