A ratiometric fluorescent chemodosimeter with selective recognition for sulfite in aqueous solution

Area of Science:

• Analytical Chemistry
• Supramolecular Chemistry
• Chemical Sensing

Background:

• Developing selective and sensitive chemosensors is crucial for environmental and biological anion detection.
• Sulfite (SO(3)(2-)) is an important anion with implications in food chemistry and environmental science, necessitating robust detection methods.

Purpose of the Study:

• To synthesize and characterize a novel fluorescent chemodosimeter for the selective detection of sulfite anions.
• To investigate the sensing mechanism, including fluorescence changes and the role of FRET and photochemical reactions.

Main Methods:

• Synthesis of a fluorescent chemodosimeter integrating guanidiniocarbonylpyrrole and 9-(aminomethyl)anthracene moieties.
• Spectroscopic analysis (fluorescence spectroscopy) to evaluate sensor performance in a 90% water/DMSO solvent mixture.
• Investigation of anion selectivity and the underlying sensing mechanisms (FRET and photochemistry).

Main Results:

• The synthesized chemodosimeter demonstrated ratiometric fluorescence responses specifically for sulfite (SO(3)(2-)) anions.
• The sensor exhibited high selectivity for sulfite over other common anions.
• The observed ratiometric changes were attributed to fluorescence resonance energy transfer (FRET) and a sulfite-induced photochemical reaction.

Conclusions:

• A novel guanidiniocarbonylpyrrole-anthracene based fluorescent chemodosimeter has been successfully developed.
• The sensor provides a selective and ratiometric method for detecting sulfite anions in aqueous media.
• The findings highlight the potential of FRET and photochemistry in designing advanced fluorescent sensors.