A Selective Fluorescent Sensor for Hg(2+).

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Development of selective fluorescent chemosensors is crucial for environmental monitoring and biological imaging.
• Rhodamine-based compounds are widely explored for their photophysical properties and sensing capabilities.

Purpose of the Study:

• To synthesize and characterize a novel rhodamine-based fluorescent chemosensor, RQP.
• To investigate the selectivity and reversibility of RQP for detecting metal ions, particularly Hg(2+).

Main Methods:

• Synthesis and characterization of RQP using NMR ((1)HNMR, (13)CNMR) and HR-MS.
• Spectroscopic analysis (UV-Vis and fluorescence spectroscopy) to study the properties of RQP.
• Metal ion selectivity studies in aqueous solutions using various cations.

Main Results:

• The novel rhodamine-based fluorescent chemosensor RQP was successfully synthesized and characterized.
• RQP exhibited high selectivity for mercury ions (Hg(2+)) compared to other tested metal ions (Ag(+), Cd(2+), Cu(2+), Na(+), Mg(2+), Ni(2+), Pb(2+), Fe(3+), and Zn(2+)).
• The metal ion recognition process by RQP was found to be reversible, as confirmed by EDTA titration experiments.

Conclusions:

• The developed rhodamine-based fluorescent chemosensor RQP is a promising tool for selective and reversible detection of Hg(2+).
• RQP's properties make it suitable for potential applications in environmental and biological sensing of mercury.