An enantioselective fluorescent sensor for sugar acids.

Area of Science:

• Analytical Chemistry
• Organic Chemistry
• Supramolecular Chemistry

Background:

• Chiral recognition of biologically relevant molecules is crucial.
• Development of selective sensors for chiral analytes remains a challenge.
• Boronic acids are versatile scaffolds for molecular recognition.

Purpose of the Study:

• To develop a chiral fluorescent sensor for enantioselective detection of sugar acids.
• To investigate the sensing capabilities of a novel chiral fluorescent boronic acid (1).

Main Methods:

• Synthesis of chiral fluorescent boronic acid 1.
• Enantioselective binding studies with various sugar acids.
• Fluorescence spectroscopy for sensing measurements.
• Single-crystal X-ray diffraction for structural elucidation.

Main Results:

• Sensor 1 demonstrated high enantioselectivity for sugar acids, with enantioselectivity ratios (K(R)/K(S)) up to 550:1.
• Exceptional chemoselectivity was observed, with selectivity ratios up to 11,000:1.
• The sensor exhibited high sensitivity, with detection limits in the micromolar range.
• Single-crystal X-ray analysis confirmed the structure of the fluorescent sensing complex.

Conclusions:

• Chiral fluorescent boronic acid 1 is a highly effective sensor for enantioselective and chemoselective detection of sugar acids.
• The sensor's performance highlights the potential of chiral boronic acids in developing advanced analytical tools.
• This work provides a foundation for designing novel fluorescent sensors for chiral recognition applications.