An ESIPT-based fluorescent probe for sensitive detection of hydrazine in aqueous solution

Area of Science:

• Analytical Chemistry
• Chemical Sensing
• Biomedical Applications

Background:

• Hydrazine is a toxic chemical requiring sensitive detection methods.
• Existing detection techniques may lack sensitivity or specificity.
• Development of advanced fluorescent probes is crucial for environmental and biological monitoring.

Purpose of the Study:

• To develop a highly sensitive fluorescent probe for hydrazine detection.
• To investigate the probe's mechanism based on Excited-State Intramolecular Proton Transfer (ESIPT) and a substitution-cyclization-elimination cascade.
• To evaluate the probe's applicability in complex biological samples.

Main Methods:

• Synthesis of a novel fluorescent probe.
• Spectroscopic analysis (fluorescence spectroscopy) to monitor probe response.
• Kinetic studies to determine detection time.
• Determination of the limit of detection (LOD).
• Cellular imaging experiments in HeLa cells.

Main Results:

• The developed probe exhibited a significant fluorescence enhancement (approximately 50-fold) at 465 nm upon hydrazine addition.
• A concurrent decrease in fluorescence at 375 nm was observed.
• Rapid detection of hydrazine was achieved within 10 minutes.
• A low limit of detection (0.147 μM) was established.
• Successful detection and imaging of hydrazine in HeLa cells demonstrated biological applicability.

Conclusions:

• A novel ESIPT-based fluorescent probe with a substitution-cyclization-elimination cascade mechanism was successfully developed for sensitive hydrazine detection.
• The probe offers rapid response, high sensitivity, and low detection limits.
• The probe's ability to detect hydrazine in living cells highlights its potential for biological and environmental monitoring applications.