A wide pH range optical sensing system based on a sol-gel encapsulated amino-functionalized corrole

Area of Science:

• Organic Chemistry
• Materials Science
• Analytical Chemistry

Background:

• Development of advanced optical chemical sensors is crucial for real-time monitoring.
• Corrole derivatives offer unique photophysical properties for sensing applications.
• Existing pH sensors often have limited response ranges or stability issues.

Purpose of the Study:

• To synthesize a novel corrole compound, 10-(4-aminophenyl)-5,15-dimesitylcorrole.
• To develop and characterize an optical chemical pH sensor utilizing this new corrole.
• To evaluate the sensor's performance, including response range, linearity, reproducibility, and interference.

Main Methods:

• Synthesis of 10-(4-aminophenyl)-5,15-dimesitylcorrole.
• Immobilization of the corrole dye in a sol-gel glass matrix.
• Characterization of the sensor's response to varying pH using fluorescence intensity measurements.
• Optimization of sensor membrane composition and experimental conditions.

Main Results:

• The synthesized corrole compound was successfully incorporated into a sol-gel matrix for pH sensing.
• The optical sensor exhibited a wide linear pH response range from 2.17 to 10.30.
• The corrole-based optode demonstrated superior pH response range compared to tetraphenylporphyrin and tris(pentafluorophenyl)corrole.
• The sensor showed good reproducibility, reversibility, and minimal interference from common inorganic ions.

Conclusions:

• 10-(4-aminophenyl)-5,15-dimesitylcorrole is a promising material for developing high-performance optical chemical pH sensors.
• The sol-gel immobilization technique provides a stable and effective platform for the sensor.
• The developed optode offers a significant advancement in pH sensing technology due to its broad linear range and robustness.