A Colorimetric and Fluorescent Sensor Based on Novel Iminocoumarin Precursor for Pd(2+) Dectection in Aqueous...

Area of Science:

• Analytical Chemistry
• Organic Chemistry
• Materials Science

Background:

• Development of selective chemosensors for heavy metal ions is crucial.
• Palladium (Pd2+) is an important element in catalysis and environmental monitoring.
• Existing methods for Pd2+ detection can lack selectivity or sensitivity.

Purpose of the Study:

• To design and synthesize a novel iminocoumarin precursor (L) for selective Pd2+ detection.
• To characterize the sensor's performance in aqueous solutions.
• To investigate the sensing mechanism of precursor L towards Pd2+.

Main Methods:

• Chemical synthesis and characterization of iminocoumarin precursor L.
• Spectroscopic analysis (UV-Vis, Fluorescence) to monitor the sensing process.
• Determination of selectivity and detection limit for Pd2+ in a mixed solvent system.

Main Results:

• Precursor L was successfully synthesized and characterized.
• Sensor L exhibited high selectivity for Pd2+ in a CH3CN:H2O solution.
• A low detection limit of 2.1 × 10(-7) M for Pd2+ was achieved.
• The sensing mechanism involves the removal of the propargylic group upon Pd2+ binding, forming an iminocoumarin.

Conclusions:

• The novel iminocoumarin precursor L serves as an effective and selective chemosensor for Pd2+.
• The developed sensor offers a sensitive analytical method for detecting palladium ions.
• This work contributes to the advancement of metal ion sensing technologies.