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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Pulling with the Pentafluorosulfanyl Acceptor in Push-Pull Dyes.

Prabhat Gautam1, Craig P Yu1, Guoxian Zhang1

  • 1Department of Chemistry and Biomolecular Sciences, University of Ottawa , 10 Marie Curie Pvt. Ottawa, Ontario K1N 6N5, Canada.

The Journal of Organic Chemistry
|September 26, 2017
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Summary
This summary is machine-generated.

New fluorescent dyes with a stable pentafluorosulfanyl (SF5) group were synthesized. These molecules exhibit unique optical properties and reversible color changes, showing potential in advanced materials applications.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Push-pull fluorophores are crucial for advanced optical materials.
  • The pentafluorosulfanyl (SF5) group offers unique electronic and stability properties.
  • Developing novel fluorophores with tunable characteristics is an ongoing research area.

Purpose of the Study:

  • To synthesize and characterize a new class of push-pull fluorophores incorporating the SF5 group.
  • To investigate the photophysical properties, including solvatofluorochromism and quantum yields.
  • To explore potential applications in responsive materials through mechanofluorochromism and postfunctionalization.

Main Methods:

  • Synthesis of six novel SF5-containing push-pull fluorophores.
  • Characterization using UV-vis/fluorescence spectroscopy and single-crystal X-ray diffraction.
  • Electrochemical analysis via cyclic voltammetry.

Main Results:

  • Successful synthesis of SF5-based fluorophores with large Stokes shifts (>100 nm).
  • Observation of pronounced solvatofluorochromic effects due to intramolecular charge transfer.
  • Demonstration of reversible mechanofluorochromism in one dye and successful postfunctionalization for visible-light absorption.

Conclusions:

  • The SF5 group is a valuable acceptor for designing novel push-pull fluorophores.
  • These dyes exhibit significant solvatofluorochromic behavior and potential for responsive materials.
  • The synthesized fluorophores show promise for applications in sensing and optoelectronics.