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Related Experiment Video

Updated: May 29, 2026

Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems
08:17

Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems

Published on: July 4, 2011

A deep cavitand with a fluorescent wall functions as an ion sensor.

Orion B Berryman1, Aaron C Sather, Julius Rebek

  • 1The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.

Organic Letters
|September 15, 2011
PubMed
Summary

Researchers developed a fluorescent deep cavitand sensor for detecting charged molecules like acetylcholine. This host-guest system also distinguishes halide ions through anion-dependent fluorescence changes.

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Area of Science:

  • Supramolecular Chemistry
  • Molecular Recognition
  • Fluorescent Sensors

Background:

  • Cavitands are macrocyclic hosts capable of molecular recognition.
  • Fluorescent probes offer sensitive detection methods for analytes.
  • Benzoquinoxaline derivatives can exhibit unique photophysical properties.

Purpose of the Study:

  • To synthesize and characterize a novel deep cavitand incorporating a fluorescent benzoquinoxaline moiety.
  • To investigate the use of this cavitand as a host-guest sensor for charged small molecules.
  • To explore the potential of the cavitand for anion sensing based on fluorescence modulation.

Main Methods:

  • Synthesis of the deep cavitand via established organic chemistry protocols.
  • Characterization using spectroscopic techniques (NMR, Mass Spectrometry) and X-ray crystallography.

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  • Fluorescence spectroscopy to monitor host-guest interactions and anion binding events.

    • Main Results:

    • Successful synthesis and full characterization of the target deep cavitand.
    • Demonstrated noncovalent binding and sensing of acetylcholine.
    • Observed distinct fluorescence changes upon interaction with different halide ions, enabling differentiation.

    Conclusions:

    • The developed deep cavitand functions as a selective sensor for charged molecules.
    • The benzoquinoxaline fluorescence is sensitive to anion binding, allowing halide ion discrimination.
    • This work presents a promising platform for developing advanced molecular sensors.