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Chromo-fluorogenic detection of nerve-agent mimics using triggered cyclization reactions in push-pull dyes.

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Summary

New azo and stilbene dyes detect nerve agent simulants through a color change. These compounds react with diethylchlorophosphate (DCP), diisopropylfluorophosphate (DFP), and diethylcyanophosphate (DCNP), enabling rapid detection in solution and gas phases.

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Area of Science:

  • Organic Chemistry
  • Analytical Chemistry
  • Chemical Sensing

Background:

  • Nerve agents pose significant threats, necessitating rapid and reliable detection methods.
  • Azo and stilbene derivatives offer potential as chromogenic and fluorogenic sensors due to their tunable electronic properties.

Purpose of the Study:

  • To synthesize novel azo and stilbene derivatives (compounds 1-9).
  • To investigate the chromo-fluorogenic response of these compounds to nerve agent simulants like DCP, DFP, and DCNP.
  • To evaluate the sensing capabilities in various solvent systems and phases.

Main Methods:

  • Synthesis of azo and stilbene derivatives with specific reactive groups.
  • Spectrophotometric and fluorometric analysis in acetonitrile and aqueous-organic mixtures.
  • Kinetic studies to determine reaction rates and half-life times.
  • Detection limit determination for nerve agent simulants.
  • Testing of solid-phase detection using silica gel.

Main Results:

  • Compounds 1-9 exhibited a hypsochromic shift upon reaction with nerve agent simulants, indicating successful detection.
  • The reaction mechanism involves acylation followed by intramolecular N-alkylation, leading to a change in electronic properties.
  • No spectral changes were observed with non-toxic organophosphorus compounds, demonstrating selectivity.
  • Effective detection limits were established for the simulants in aqueous-organic solutions.
  • Successful chromogenic detection of nerve agent simulants in both solution and gas phases was achieved.

Conclusions:

  • The synthesized azo and stilbene derivatives are effective chromogenic sensors for nerve agent simulants.
  • The sensing mechanism relies on a triggered cyclization reaction altering the dye's electronic structure.
  • These compounds show promise for developing rapid, selective, and sensitive detection systems for organophosphorus compounds.