A tryptophan-containing fluorescent intramolecular complex as a designer peptidic proton sensor

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Chemical Sensing

Background:

• Development of novel molecular scaffolds is crucial for advanced chemical sensors.
• Bispidine derivatives offer unique structural properties for molecular design.
• Fluorescent probes are valuable tools for detecting analytes in solution.

Purpose of the Study:

• To design and synthesize a novel bispidine-based molecular probe.
• To investigate the fluorescent properties of the probe in polar solvents.
• To evaluate the probe's performance for proton sensing.

Main Methods:

• Synthesis of a novel bispidine scaffold incorporating pyrene and tryptophan moieties.
• Spectroscopic analysis (fluorescence) in various polar solvents.
• Protonation studies to assess sensing capabilities and reversibility.

Main Results:

• Formation of an unprecedented emissive intramolecular complex in polar solvents.
• Selective enhancement of pyrene fluorescence upon protonation.
• Demonstrated sensitivity, selectivity, and reversibility for proton sensing.

Conclusions:

• The novel bispidine scaffold enables the creation of a unique fluorescent probe.
• The probe exhibits promising characteristics for effective proton sensing.
• This design opens avenues for developing bispidine-peptide based sensors.