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Bispyrene/surfactant-assembly-based fluorescent sensor array for discriminating lanthanide ions in aqueous solution.

Shihuai Wang1, Liping Ding, Junmei Fan

  • 1Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710062, P. R. China.

ACS Applied Materials & Interfaces
|September 5, 2014
PubMed
Summary

A novel fluorescent sensor array effectively identifies multiple lanthanide ions. This array uses bispyrene derivatives and surfactant assemblies, offering a new method for detecting these valuable, similar elements.

Keywords:
SDSpattern recognitionpyrenesensingsupramolecular assembly

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Lanthanides are critical industrial resources, but their similar chemical properties make selective detection challenging.
  • Accurate identification of lanthanide ions is essential across various scientific and industrial applications.
  • Existing methods for lanthanide detection often lack the sensitivity or selectivity required for complex mixtures.

Purpose of the Study:

  • To develop a highly sensitive and selective fluorescent sensor array for the detection and identification of lanthanide ions.
  • To investigate the sensing mechanism involving bispyrene derivatives and anionic surfactant assemblies.
  • To demonstrate the array's capability in distinguishing between similar lanthanide ions in aqueous solutions.

Main Methods:

  • Fabrication of a fluorescent sensor array using three cationic bispyrene derivatives and anionic surfactant assemblies.
  • Utilizing fluorescence spectroscopy to monitor changes in monomer and excimer emissions upon interaction with lanthanide ions.
  • Applying Principle Component Analysis (PCA) for pattern recognition and identification of specific lanthanide ions.
  • Conducting UV-vis absorption and fluorescence titration experiments to elucidate the sensing mechanism.

Main Results:

  • The sensor array exhibited cross-reactive fluorescence responses to lanthanide ions, generating a unique six-signal pattern.
  • Principle Component Analysis successfully identified six lanthanide ions (La3+, Pr3+, Nd3+, Eu3+, Ho3+, Er3+) from the similar group.
  • UV-vis and fluorescence titration data indicated that electrostatic attraction between lanthanide ions and the anionic surfactant, not direct fluorophore binding, is key to the sensing mechanism.
  • Control experiments confirmed no cross-reactivity with divalent metal ions, highlighting the specificity for trivalent lanthanides.

Conclusions:

  • A robust fluorescent sensor array capable of identifying multiple similar lanthanide ions has been successfully developed.
  • The array's recognition mechanism relies on the synergistic interaction between lanthanide ions, bispyrene derivatives, and anionic surfactants.
  • This approach offers a promising new avenue for the selective detection and analysis of valuable lanthanide resources.