A "reactive" ratiometric fluorescent probe for mercury species

Area of Science:

• Analytical Chemistry
• Environmental Science
• Materials Science

Background:

• Mercury species pose significant environmental and health risks.
• Development of selective and sensitive detection methods for mercury is crucial.
• Fluorescent probes offer advantages in sensitivity and real-time monitoring.

Purpose of the Study:

• To develop a ratiometric fluorescent probe for the selective detection of mercury species.
• To investigate the mechanism of probe response.
• To assess the probe's applicability for detecting organomercury compounds.

Main Methods:

• Synthesis of a vinyl ether derivative of 2-(benzothiazol-2-yl)phenol.
• Utilizing metal-promoted hydrolysis for probe activation.
• Employing the excited-state intramolecular proton transfer (ESIPT) mechanism for fluorescence signaling.
• Performing fluorescence titration to quantify mercury species.

Main Results:

• The developed probe exhibits selective response to mercury species over other metal ions.
• A distinct fluorescence color change from blue to cyan was observed.
• The probe demonstrated sensitivity to both inorganic mercury (HgCl2) and organomercury species (RHgCl).
• Fluorescence titration indicated a complete response with 0.5 equiv of HgCl2.

Conclusions:

• A novel ratiometric fluorescent probe for mercury detection has been successfully developed.
• The probe operates via metal-promoted hydrolysis and ESIPT, offering selective and visual detection.
• The probe's ability to detect both inorganic and organomercury species enhances its environmental monitoring potential.