Triethylsulfonium bis(trifluoromethylsulfonyl)imide, CAS: 321746-49-0

Key Applications:

Energy Storage & Electrochemistry

• Electrolyte component for lithium, sodium, and multivalent batteries, where the sulfonium cation enhances oxidative stability and suppresses parasitic reactions.
• High‑voltage supercapacitor electrolyte, leveraging the wide electrochemical window of the TFSI anion.
• Redox‑active media in flow batteries, particularly where low volatility and thermal stability are required.
• Electrode wetting agent improving interfacial ion transport in porous carbons and metal oxides.

Catalysis & Organic Synthesis

• Solvent and co‑solvent for transition‑metal catalysis, especially C–C and C–N bond‑forming reactions requiring non‑coordinating media.
• Medium for acid‑catalyzed transformations, where the sulfonium cation provides enhanced Brønsted acidity relative to ammonium analogues.
• Phase‑transfer catalyst environment, enabling reactions involving poorly soluble inorganic salts.

High‑Temperature & Harsh‑Environment Applications

• Heat‑transfer and thermal‑management fluids in systems requiring low vapor pressure and high thermal stability.
• Lubrication additives improving anti‑wear and anti‑static performance in high‑temperature mechanical systems.
• Stable dielectric fluid for high‑frequency or high‑temperature electronics.

Polymer, Membrane & Materials Processing

• Plasticizer or processing aid for engineering polymers, improving flexibility and conductivity.
• Precursor medium for ion‑conductive polymer electrolytes, including PEO‑based and poly(ionic liquid) systems.
• Template or structure‑directing agent in nanoporous materials and hybrid organic–inorganic frameworks.

Surface, Antistatic & Coating Technologies

• Antistatic additive for coatings, films, and specialty plastics, enabled by high ionic mobility.
• Surface‑modification agent improving wettability and charge dissipation on metals, ceramics, and composites.
• Electrochemical deposition medium for metals and alloys requiring smooth, uniform films.

Separation & Extraction

• Extractant for metal ions, particularly soft metals compatible with the TFSI anion’s weak coordination.
• Solvent for gas absorption, including SO₂ and CO₂, where sulfonium ILs show enhanced uptake relative to ammonium analogues.
• Medium for biphasic catalysis, enabling clean phase separation and catalyst recycling.

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