Fluorescent imine-linked covalent organic framework turn off sensor for sensitive Co²⁺ ions detection

Area of Science:

• Materials Science
• Environmental Chemistry
• Analytical Chemistry

Background:

• Detecting heavy metal ions is vital for environmental remediation.
• Achieving high selectivity in metal ion detection remains a significant challenge.
• Innovative materials are needed for sensitive and selective environmental monitoring.

Purpose of the Study:

• To design and synthesize a novel imine-based covalent organic framework (COF).
• To develop an efficient method for detecting cobalt ions (Co²⁺) in environmental samples.
• To investigate the fluorescence properties and sensing mechanism of the COF.

Main Methods:

• Schiff base condensation was used to synthesize the imine-based COF.
• The COF's fluorescence properties were utilized for sensing applications.
• Fluorescence quenching was employed to detect Co²⁺ through coordination interactions.

Main Results:

• The imine-based COF exhibited excellent fluorescence properties due to its π-conjugation system.
• The COF demonstrated high sensitivity with a limit of detection of 8.5 × 10^-13 M for Co²⁺.
• The sensor showed remarkable selectivity, rapid response, and stability in detecting Co²⁺ in complex environmental samples.

Conclusions:

• The developed imine-based COF sensor provides a simple, sensitive, and selective method for Co²⁺ detection.
• This research offers new insights into the design and application of COFs for environmental monitoring.
• The findings support the development of COF-based technologies for effective environmental remediation and monitoring.