Preparation and characterization of novel crown ether functionalized ionic liquid-based solid-phase microextraction...

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Solid phase microextraction (SPME) is a widely used technique for sample preparation.
• Development of selective and stable stationary phases is crucial for improving SPME efficiency.
• Ionic liquids (ILs) offer unique properties for SPME applications.

Purpose of the Study:

• To synthesize and characterize a novel crown ether functionalized ionic liquid.
• To prepare task-specific IL-based SPME fibers using sol-gel and free radical cross-linking.
• To evaluate the performance of the developed SPME fibers for extracting various analytes.

Main Methods:

• Synthesis of 1-allyl-3-(6'-oxo-benzo-15-crown-5 hexyl) imidazolium hexafluorophosphate.
• Preparation of IL-based SPME fibers via sol-gel method and free radical cross-linking.
• Characterization using FT-IR spectroscopy and performance evaluation for various analytes.

Main Results:

• Successful synthesis and immobilization of crown ether functionalized IL onto a hybrid organic-inorganic copolymer.
• The developed SPME fibers exhibit a porous surface, high thermal stability (up to 340 °C), and good reproducibility.
• Superior extraction efficiencies for alcohols, phthalate esters, phenolic environmental estrogens, fatty acids, and aromatic amines compared to non-functionalized IL-based fibers and commercial SPME fibers.

Conclusions:

• The novel crown ether functionalized ionic liquid-based SPME fibers offer enhanced selectivity and efficiency for a range of analytes.
• The sol-gel and free radical cross-linking approach provides a robust method for creating stable and high-performance SPME coatings.
• This new SPME material shows significant potential for environmental monitoring and chemical analysis applications.