A Highly Selective Probe for Real-Time Monitoring of Ethylenediamine with Ratiometric Luminescent and Colorimetric...

Area of Science:

• Chemical Sensing
• Molecular Probes
• Analytical Chemistry

Background:

• Ethylenediamine (EDA) is a vital industrial chemical with potential health risks.
• Real-time monitoring of EDA is crucial for safety and environmental applications.
• Existing detection methods may lack sensitivity or selectivity for EDA.

Purpose of the Study:

• To develop a novel molecular probe for sensitive and selective real-time detection of EDA.
• To investigate the sensing mechanism of the probe.
• To create a practical sensing platform for EDA vapor detection.

Main Methods:

• Synthesis of a dual-mode molecular probe (p-N-DPC·I2) exhibiting ratiometric luminescent and colorimetric responses.
• Experimental and theoretical studies to elucidate the charge transfer (CT) sensing mechanism.
• Development of a hydrogel-based sensing chip for EDA vapor detection.

Main Results:

• The probe demonstrated high sensitivity and selectivity towards EDA through dual-mode detection.
• The sensing mechanism was confirmed to involve the formation of a charge transfer (CT) state.
• The hydrogel-based chip achieved naked-eye detection of EDA vapor at concentrations as low as 10 ppm.

Conclusions:

• A novel molecular probe (p-N-DPC·I2) was successfully developed for ratiometric fluorescent and colorimetric detection of EDA.
• The probe offers a highly sensitive and selective method for real-time EDA monitoring in both solution and vapor phases.
• The developed hydrogel sensing chip provides a promising platform for practical, ultrasensitive EDA vapor recognition.