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Highly sensitive detection of cobalt through fluorescence changes in β-cyclodextrin-bimane complexes.

Apurba Pramanik1, Sara Amer1, Flavio Grynszpan1

  • 1Department of Chemical Sciences, Ariel University, 65 Ramat HaGolan Street, Ariel, Israel. mindyl@ariel.ac.il flaviog@ariel.ac.il.

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A new fluorescent sensor using syn-(methyl,methyl)bimane and β-cyclodextrin detects cobalt ions with high sensitivity. This method allows for cobalt quantitation in both solutions and on filter paper.

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Area of Science:

  • Analytical Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Fluorescence-based sensing offers high sensitivity for metal ion detection.
  • Supramolecular complexes can enhance sensor selectivity and performance.
  • Cobalt ion detection is crucial in environmental and biological monitoring.

Purpose of the Study:

  • To develop a sensitive and selective fluorescent sensor for cobalt ions.
  • To investigate the supramolecular interactions responsible for sensor function.
  • To enable cobalt quantitation in various media, including solid supports.

Main Methods:

  • Formation of a supramolecular complex between syn-(methyl,methyl)bimane and β-cyclodextrin.
  • Utilizing a fluorescence turn-off mechanism for cobalt detection.
  • Employing 1H NMR spectroscopy to elucidate interaction mechanisms.
  • Developing calibration curves for quantitative analysis in solution and on filter paper.

Main Results:

  • The syn-(methyl,methyl)bimane/β-cyclodextrin complex exhibited a sensitive fluorescence turn-off response to cobalt.
  • A low limit of detection (0.60 nM) was achieved for cobalt.
  • The sensor demonstrated selectivity for cobalt in aqueous media.
  • Quantitative analysis of cobalt was successfully performed in solution and on adsorbed filter papers.

Conclusions:

  • The developed supramolecular complex serves as an effective fluorescent sensor for cobalt ions.
  • The sensor's performance is attributed to specific interactions between bimane, cyclodextrin, and cobalt.
  • This approach provides a versatile platform for sensitive and selective cobalt detection.