Carbamodithioate-based dual functional fluorescent probe for Hg(2+) and S(2-)

Area of Science:

• Analytical Chemistry
• Chemical Sensing
• Materials Science

Background:

• Mercury (Hg2+) and sulfide (S2-) ions are significant environmental and biological analytes.
• Developing selective and sensitive probes for these ions is crucial for monitoring and safety.
• Existing detection methods may lack dual-functionality or specific signaling mechanisms.

Purpose of the Study:

• To design and synthesize a novel carbamodithioate-based compound (T1) as a dual-functional fluorescent probe.
• To investigate the probe's response to Hg(2+) ions and S(2-) anions.
• To elucidate the signaling mechanism based on intramolecular charge transfer (ICT).

Main Methods:

• Synthesis of the carbamodithioate-based compound T1.
• Fluorescence spectroscopy was employed to study the probe's behavior.
• Investigation of the probe's response to varying concentrations of Hg(2+) and S(2-) ions.
• Analysis of the fluorescence changes to determine the sensing mechanism.

Main Results:

• Compound T1 was successfully synthesized.
• T1 exhibited direct "on-off" fluorescence quenching for Hg(2+) detection.
• T1 showed indirect "on-off-on" fluorescence changes for S(2-) anion detection.
• The sensing mechanism was confirmed to be intramolecular charge transfer (ICT).

Conclusions:

• The carbamodithioate-based compound T1 functions as an effective dual-functional fluorescent probe.
• T1 allows for selective detection of Hg(2+) and S(2-) through distinct fluorescence responses.
• The ICT mechanism provides a clear basis for the observed signaling, enabling sensitive and reliable detection.