Barium ion sensing with IPG K⁺ molecular probes

Area of Science:

• Analytical Chemistry
• Chemical Sensing
• Fluorescence Spectroscopy

Background:

• Azacrown ether ionophores coupled with fluorophores create sensitive turn-on chemosensors.
• Ionophore binding domain characteristics influence selectivity and fluorescence sensing mechanisms.
• Aza-18-crown-6 ethers show selectivity for K+ and Ba2+, with Ba2+ exerting a greater electronic effect.

Purpose of the Study:

• To evaluate the efficacy of three commercially available K+ chemosensors as Ba2+ ion probes.
• To characterize the performance of these chemosensors for Ba2+ detection using spectrofluorometry.
• To explore their application in low-background single-ion fluorescence microscopy.

Main Methods:

• Bulk spectrofluorometry for aqueous solution characterization.
• Utilizing existing K+ chemosensors for Ba2+ ion detection.
• Single-ion fluorescence microscopy for low-background imaging.

Main Results:

• Three K+ chemosensors demonstrated significant capability as Ba2+ probes.
• Characterization in aqueous solutions confirmed their sensing potential.
• Successful application in low-background single-ion fluorescence microscopy was shown.

Conclusions:

• Existing K+ chemosensors can be repurposed for effective Ba2+ sensing.
• These findings introduce novel candidates for Ba2+ ion detection in various fields.
• The study highlights the versatility of azacrown ether-based fluorescent chemosensors.