Ratiometric Fluorescence Sensing of Arsenate(V) and Phosphate Ions Using an Inclusion Complex of Modified...

Area of Science:

• Supramolecular chemistry
• Analytical chemistry
• Environmental science

Background:

• Group 15 anions, including phosphate (Pi) and arsenate (As(V)), pose significant environmental and health risks.
• Simple and effective detection methods for these oxyanions are highly desired.

Purpose of the Study:

• To design and develop a novel supramolecular complex for the selective fluorescence sensing of Pi and As(V).
• To investigate the sensing mechanism and evaluate the sensor's performance in real-world samples.

Main Methods:

• A supramolecular complex (Zn-C6O/FBγCyD) was synthesized, combining a zinc(II)-dipicolylamine fluorescent probe (Zn-C6O) with a modified cyclodextrin (FBγCyD).
• Fluorescence spectroscopy and induced circular dichroism (ICD) were employed to analyze anion binding and sensing mechanisms.
• Spike tests in well water samples were conducted to assess practical applicability.

Main Results:

• The Zn-C6O/FBγCyD complex exhibited selective ratiometric fluorescence detection of Pi through pyrene dimer formation within the FBγCyD cavity.
• A similar ratiometric response was observed for As(V) with a linear range of 5-30 μM.
• Successful detection of As(V) was demonstrated in spiked well water samples, even with interfering substances.

Conclusions:

• The developed cyclodextrin-based supramolecular chemosensor offers a promising platform for detecting oxyanions with high water solubility, structural simplicity, and enhanced selectivity.
• This approach provides a viable method for the environmental monitoring of Pi and As(V).