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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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 position.

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Alkoxy-styryl DCDHF fluorophores.

Enrique Font-Sanchis1, Raquel E Galian, Francisco J Céspedes-Guirao

  • 1División de Química Orgánica, Instituto de Bioingeniería, Universidad Miguel Hernández, Av. de la Universidad s/n, 03202 Elche, Alicante, Spain.

Physical Chemistry Chemical Physics : PCCP
|May 18, 2010
PubMed
Summary

Researchers developed a photostable dicyanomethylenedihydrofuran fluorophore with electron-donating alkoxy groups. This environmentally-sensitive fluorescent reporter forms unique dark states in low viscosity solvents upon light excitation.

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Area of Science:

  • Organic chemistry
  • Photophysics
  • Materials science

Background:

  • Fluorescent reporters are crucial tools in various scientific disciplines.
  • Developing photostable and environmentally-sensitive fluorophores is an ongoing challenge.
  • Understanding photophysical processes, such as dark state formation, is key to designing advanced materials.

Purpose of the Study:

  • To synthesize and characterize a novel photostable dicyanomethylenedihydrofuran fluorophore.
  • To investigate the environmental sensitivity of the synthesized fluorophore.
  • To explore the photophysical behavior, including dark state formation, of the fluorophore in different solvent viscosities.

Main Methods:

  • Chemical synthesis of the dicyanomethylenedihydrofuran derivative.
  • Spectroscopic analysis (absorption and emission) to determine photophysical properties.
  • Viscosity-dependent fluorescence measurements to assess environmental sensitivity.
  • Transient absorption spectroscopy to investigate excited-state dynamics and dark state formation.

Main Results:

  • A novel dicyanomethylenedihydrofuran fluorophore with electron-donating alkoxy groups was successfully synthesized.
  • The fluorophore exhibits high photostability.
  • Remarkable environmental sensitivity was observed, indicating its potential as a reporter.
  • In low viscosity solvents, light excitation led to the formation of dark states, which were characterized and confirmed not to be radical or triplet in nature.

Conclusions:

  • The described dicyanomethylenedihydrofuran fluorophore is a promising candidate for fluorescent reporting applications due to its photostability and environmental sensitivity.
  • The formation of non-radical/non-triplet dark states in low viscosity solvents is a unique photophysical property that warrants further investigation.
  • This study contributes to the development of advanced fluorescent materials with tailored properties.