A simple pyridine based fluorescent chemosensor for selective detection of copper ion

Area of Science:

• Chemical Sensing
• Coordination Chemistry
• Analytical Chemistry

Background:

• Development of selective sensors for metal ions is crucial for environmental monitoring and biological studies.
• Pyridine-based receptors offer versatile platforms for metal ion complexation and detection.

Purpose of the Study:

• To synthesize and characterize a novel pyridine-based receptor for selective copper ion detection.
• To investigate the sensing mechanism and performance of the receptor using various spectroscopic techniques.
• To evaluate the practical applicability of the receptor for copper ion determination in water samples.

Main Methods:

• Synthesis of a novel pyridine-based receptor (S).
• Spectroscopic analysis including colorimetry, UV-Visible absorption, and fluorescence spectroscopy.
• Job's method and Electrospray Ionization Mass Spectrometry (ESI-MS) for stoichiometric analysis.
• Quantum chemical calculations for theoretical validation.
• Application in real water sample analysis.

Main Results:

• The receptor exhibited selective colorimetric and fluorometric responses to copper ions (Cu2+) in a CH3CN/H2O mixture.
• A visible color change from colorless to yellow/cyan was observed.
• Complexation with Cu2+ resulted in a new UV-Vis band at 419 nm and a fluorescence emission at 494 nm.
• The limit of detection (LOD) for Cu2+ was determined to be 0.25 μM.
• The receptor was successfully applied to detect Cu2+ in various water samples.

Conclusions:

• The developed pyridine-based receptor demonstrates excellent selectivity and sensitivity for copper ion detection.
• The spectroscopic and theoretical studies confirm the complexation mechanism.
• The receptor's effectiveness in real water samples highlights its potential for practical environmental monitoring applications.