1-Ethylimidazolium bis(trifluoromethylsulfonyl)imide, CAS: 353239-10-8

Key Applications:

Electrochemical Systems

• Proton‑conducting component in solid‑state and gel polymer electrolytes for fuel cells and proton batteries.
• Additive in supercapacitor electrolytes to enhance ionic mobility and widen the electrochemical stability window.
• Medium for electrodeposition of metals and alloys under water‑free conditions.

Catalysis and Organic Synthesis

• Brønsted‑acidic ionic environment for acid‑catalyzed transformations, including esterifications, dehydrations, and rearrangements.
• Solvent for transition‑metal catalysis, benefiting from TFSI’s weakly coordinating nature.
• Reaction medium for selective oxidations and C–N/C–O bond‑forming reactions requiring controlled proton activity.

Materials Processing

• Solvent or co‑solvent for polymer dissolution, ionomer processing, and membrane fabrication.
• Component in ionogels and hybrid polymer–ionic liquid composites where proton mobility and hydrophobicity are required.
• Plasticizer for high‑temperature elastomers and fluorinated polymers.

Separation Science

• Phase‑selective solvent for liquid–liquid extraction of aromatic hydrocarbons, metal ions, and polar organics.
• Tunable medium for CO₂ capture and other gas‑absorption studies due to TFSI’s low coordinating strength.

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