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Chromone functionalized pyridine chemosensor for cupric ions detection.

Parul Bhalla1, Nisha Tomer1, Pooja Bhagat2

  • 1Department of Chemistry, Guru Jambheshwar University of Science and Technology, Hisar 125001, India.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|August 26, 2021
PubMed
Summary

A novel Schiff base (CD) effectively detects cupric ions (Cu2+) with high sensitivity and selectivity. This Schiff base demonstrates stability and works across a wide pH range, making it suitable for real-world water sample analysis.

Keywords:
2, 6-Diaminopyridine3-Formyl chromoneFluorescenceLOD, Binding constant

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Schiff bases are versatile ligands with applications in sensing.
  • Developing selective and sensitive chemosensors for metal ions is crucial for environmental monitoring.
  • Chromone-based Schiff bases offer unique photophysical properties for detection applications.

Purpose of the Study:

  • To synthesize and characterize a new Schiff base (CD) derived from 2,6-diaminopyridine and 3-formyl chromone.
  • To investigate the sensing capabilities of Schiff base CD for cupric ions (Cu2+) detection.
  • To evaluate the selectivity, stability, and applicability of the Schiff base sensor in real water samples.

Main Methods:

  • Synthesis of Schiff base CD via condensation reaction.
  • Characterization using FTIR, HRMS, and 1H NMR spectroscopy.
  • Spectrophotometric and spectrofluorometric analysis for metal ion sensing.
  • Job's plot, Benesi-Hildebrand equation, DFT calculations, and interference studies for sensor evaluation.

Main Results:

  • Schiff base CD selectively detected cupric ions with a significant decrease in emission intensity.
  • The binding stoichiometry was determined to be 1:2 (CD:Cu2+).
  • A low limit of detection (1.2 × 10-6 M) and high regression coefficient (98.7%) were achieved.
  • The sensor exhibited excellent stability and selectivity, with optimal performance in the pH range of 6-11.
  • Successful application in detecting Cu2+ in various spiked water samples.

Conclusions:

  • The synthesized Schiff base CD is a highly effective and selective chemosensor for cupric ions.
  • The sensor demonstrates robustness and applicability in complex environmental matrices.
  • This study provides a promising platform for developing advanced metal ion detection systems.