Zwitterionic BODIPYs with large stokes shift: small molecular biomarkers for live cells

Area of Science:

• Organic Chemistry
• Materials Science
• Biophysical Chemistry

Background:

• Boron-dipyrromethene (BODIPY) dyes are widely used in various applications due to their photophysical properties.
• Zwitterionic compounds possess unique electronic and solubility characteristics.
• Developing novel BODIPY derivatives with enhanced properties is crucial for advanced applications.

Purpose of the Study:

• To synthesize and characterize the first examples of zwitterionic BODIPY molecules.
• To investigate their optical behavior, electronic conjugation, and structural properties.
• To explore their potential utility in bio-imaging and cell viability studies.

Main Methods:

• Nucleophilic Aromatic Substitution (S_N-Ar) methodology for synthesis.
• Single crystal X-ray diffraction (XRD) for structural elucidation.
• Nuclear Magnetic Resonance (NMR) and Density Functional Theory (DFT) for electronic conjugation analysis.

Main Results:

• Successful synthesis of two novel zwitterionic BODIPY compounds.
• Demonstrated large Stokes shift and intense emission, preventing self-quenching.
• Confirmed zwitterionic nature and electronic conjugation through XRD, NMR, and DFT.
• Exhibited enhanced solubility in aqueous conditions.

Conclusions:

• The synthesized zwitterionic BODIPYs possess superior optical properties and aqueous solubility.
• These molecules show significant promise for bio-imaging applications, with observed localization in live yeast cells.
• This work introduces a new class of BODIPY dyes with potential for biological and materials science applications.