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Dipyrenylcalix[4]arene--a fluorescence-based chemosensor for trinitroaromatic explosives.

Young Hoon Lee1, Hongguang Liu, Jin Yong Lee

  • 1Department of Chemistry, Korea University, Seoul 136-701, Republic of Korea.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 1, 2010
PubMed
Summary

A novel dipyrenyl calix[4]arene chemosensor effectively detects nitroaromatics. This sensor utilizes excimer emission quenching, achieving high sensitivity for trinitroaromatics like TNT down to parts per billion levels.

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Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Nitroaromatic compounds pose significant detection challenges due to their widespread use and hazardous nature.
  • Existing detection methods often lack the required sensitivity or selectivity.
  • Calix[4]arene derivatives offer promising platforms for molecular recognition and sensing applications.

Purpose of the Study:

  • To develop a new chemosensor for the sensitive and selective detection of nitroaromatic compounds.
  • To investigate the photophysical properties and sensing mechanism of a dipyrenyl calix[4]arene.
  • To establish the quantitative detection limits for specific nitroaromatics.

Main Methods:

  • Synthesis and characterization of a dipyrenyl calix[4]arene (L).
  • Spectroscopic studies including 1H NMR, UV/Vis, and fluorescence spectroscopy in acetonitrile and chloroform.
  • Fluorescence titration experiments to determine analyte binding and detection limits.
  • Single-crystal X-ray diffraction analysis of the L.TNT complex.
  • Ab initio calculations to support proposed interaction mechanisms.

Main Results:

  • The dipyrenyl calix[4]arene (L) effectively quenches excimer emission upon binding with nitroaromatics.
  • Trinitroaromatic compounds, particularly TNT, showed the highest response and sensitivity.
  • Quantitative analysis demonstrated TNT detection down to low parts per billion (ppb) levels in acetonitrile.
  • X-ray diffraction revealed a supramolecular polymer structure driven by pi-pi interactions and hydrogen bonds.
  • Spectroscopic changes and ab initio calculations confirmed charge-transfer interactions between the pyrene subunits and nitroaromatics.

Conclusions:

  • The developed dipyrenyl calix[4]arene serves as a highly sensitive chemosensor for nitroaromatic detection.
  • The sensing mechanism involves analyte-induced excimer emission quenching via charge-transfer interactions.
  • This approach offers a promising method for the trace-level detection of hazardous nitroaromatic explosives and pollutants.