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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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Halogens03:01

Halogens

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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

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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.
Along with electronic...
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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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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Radicals: Electronic Structure and Geometry01:07

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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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Luminescent Perhalofluoro Trityl Radicals.

Johanna Schlögl1, Alexander R Krappe2, Paul C Fürstenwerth3

  • 1Institut für Chemie und Biochemie - Anorganische Chemie, Freie Universität Berlin, Fabeckstraße 34/36, 14195 Berlin, Germany.

Journal of the American Chemical Society
|November 10, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized highly fluorinated trityl radicals with superior fluorescence and photostability. These novel luminescent radicals offer expanded emission ranges and potential for new applications.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Trityl radicals are known for their unique electronic and optical properties.
  • Existing polyhalogenated trityl radicals have limitations in fluorescence and stability.
  • Developing new luminescent materials with enhanced characteristics is crucial for advanced applications.

Purpose of the Study:

  • To synthesize and characterize novel polyfluorinated trityl radicals with high fluorination grades.
  • To investigate the electro-optical properties and photostability of these new radicals.
  • To explore the potential of these radicals in materials science applications, such as in nanoparticles.

Main Methods:

  • Synthesis of perhalofluoro trityl cations via functionalization of perfluorinated trityl cation with trimethylsilyl halides.
  • Reduction of perhalofluoro trityl cations using commercial zinc powder to obtain polyfluorinated trityl radicals.
  • Characterization of electro-optical properties, including fluorescence quantum yields and luminescence lifetimes.
  • Investigation of photostability under light irradiation and stability under ambient conditions.
  • Analysis of radical-stained polystyrene nanoparticles for emission properties and excimer formation.
  • Structural characterization of oxidation products (peroxides) using single-crystal X-ray diffraction.

Main Results:

  • Successful synthesis of three perhalofluoro trityl radicals with high fluorination grades in quantitative yields.
  • Polyfluorinated trityl radicals exhibit significantly higher fluorescence quantum yields and longer luminescence lifetimes compared to polychlorinated analogs.
  • Expanded emission range extending into the yellow spectral region and enhanced photostability under irradiation.
  • Observation of an additional red-NIR emission band in radical-stained polystyrene nanoparticles, attributed to excimer formation.
  • Investigation revealed slow conversion with atmospheric oxygen, forming characterized peroxides.

Conclusions:

  • The study successfully developed a straightforward method to access highly fluorinated trityl radicals.
  • These novel polyfluorinated trityl radicals possess superior electro-optical properties, including enhanced luminescence and photostability.
  • The findings open new avenues for designing a wide range of luminescent polyfluorinated trityl radicals for diverse applications.