1-(2-Hydroxyethyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, CAS: 174899-86-6

Key Applications:

Electrochemical Systems

• Serves as a high‑stability ionic liquid electrolyte for lithium, sodium, and multivalent ion batteries, leveraging the TFSI anion’s wide electrochemical window and the cation’s enhanced polarity.
• Used in supercapacitors and hybrid capacitors where low volatility and high ionic conductivity are required.
• Supports electrodeposition studies of metals and alloys under water‑free, thermally stable conditions.

Catalysis and Synthesis

• Functions as a polar, non‑volatile reaction medium for acid‑catalyzed, transition‑metal‑catalyzed, and biocatalytic transformations.
• The hydroxyethyl substituent enables improved solvation of polar substrates and intermediates, supporting selective transformations and rate enhancements.
• Applied in biphasic catalysis where phase separation and ionic liquid recyclability are advantageous.

Separation Science

• Effective as an extraction phase for metal ions, organic acids, and polar organics due to its tunable polarity and strong hydrogen‑bonding capability.
• Utilized in liquid–liquid extraction systems requiring low miscibility with nonpolar solvents and high thermal stability.
• Supports chromatographic method development as a stationary‑phase additive or mobile‑phase modifier.

Materials and Polymer Science

• Incorporated into polymer electrolytes and ion‑conducting membranes to enhance ionic mobility, mechanical flexibility, and thermal stability.
• Used as a plasticizer or conductivity enhancer in solid polymer matrices, including PEO‑based and imidazolium‑functionalized polymers.
• Enables fabrication of ionogels with stable mechanical properties and broad electrochemical windows.

Surface and Interface Engineering

• Applied in surface modification protocols where the hydroxyethyl group promotes adhesion to oxide surfaces.
• Supports formation of stable interfacial layers in electrochemical devices, improving charge transfer and reducing degradation.
• Used in lubrication studies as a low‑volatility, thermally robust ionic medium.

CO₂ Capture and Gas Handling

• Demonstrates strong CO₂ solubility and selectivity, making it suitable for absorption, separation, and catalytic conversion studies.
• The hydroxyl functionality enhances interactions with acidic gases and supports reversible sorption processes.

Analytical and Spectroscopic Applications

• Serves as a stable, low‑vapor‑pressure solvent for NMR, IR, and electrochemical spectroscopy.
• Useful in studying solvation dynamics, ion pairing, and hydrogen‑bonding networks due to its well‑defined structure and high purity.

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