Morpholine-modified polyacrylamides with Polymerization-Induced emission and its specific detection to Cu2+ ions
Enze Fan1, Huiying Guo1, Tingting Hao1
1Key Laboratory of Analytical Science and Technology of Hebie Province (Project Number: 22567620H), College of Chemistry and Materials Science, Hebei University, Baoding 071002, China.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|January 12, 2024
Summary
Researchers developed morpholine-modified polyacrylamide derivatives (MMPAm) with polymerization-induced emission (PIE). Poly(N-morpholine acrylamide) (PNMPA) specifically detects Cu2+ ions through fluorescence quenching, offering a promising material for ion detection.
Area of Science:
- Polymer Chemistry
- Materials Science
- Analytical Chemistry
Background:
- Development of novel fluorescent polymers for sensing applications.
- Investigating polymerization-induced emission (PIE) in functionalized polyacrylamides.
- Need for selective and sensitive detection methods for metal ions like Cu2+.
Purpose of the Study:
- To synthesize and characterize morpholine-modified polyacrylamide derivatives (MMPAm).
- To explore the polymerization-induced emission (PIE) properties of MMPAm.
- To evaluate the potential of these polymers for the specific detection of Cu2+ ions.
Main Methods:
- Free radical polymerization of morpholine-containing monomers to synthesize MMPAm.
- Characterization of PIE properties, including fluorescence emission and quantum yield.
- Fluorescence spectroscopy for selective Cu2+ detection, including quenching studies, Job's plot analysis, and reversibility testing with EDTA.
Main Results:
- Successfully synthesized three MMPAm derivatives exhibiting significant PIE.
- Poly(N-morpholine acrylamide) (PNMPA) showed strong fluorescence at 450 nm with a quantum yield of 2.87%.
- PNMPA demonstrated specific and sensitive detection of Cu2+ ions via fluorescence quenching (detection limit 17.3 μM) even in the presence of other metal ions.
Conclusions:
- Intramolecular aggregation of morpholine rings in PNMPA is responsible for its PIE.
- PNMPA serves as a promising fluorescent probe for the selective detection of Cu2+ ions.
- A reversible detection system and portable test paper for Cu2+ were developed using PNMPA.
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