Tributylmethylphosphonium bis(fluorosulfonyl)imide, CAS: 2253137-97-0

Key Applications:

Electrochemical Systems

• Lithium‑ion and sodium‑ion battery electrolytes where FSI⁻ enhances ionic conductivity and supports stable SEI formation.
• High‑voltage electrolyte formulations requiring wide electrochemical stability and low flammability.
• Electrodeposition media for controlled metal plating under water‑free, tunable ionic conditions.

Catalysis and Synthesis

• Phase‑transfer and biphasic catalysis, leveraging the phosphonium cation’s stability and the ionic liquid’s immiscibility with many organic phases.
• Lewis‑acid‑assisted transformations, where the FSI⁻ anion provides weakly coordinating behavior suitable for cationic intermediates.
• Solvent and reaction medium for high‑temperature or moisture‑sensitive processes.

Materials Processing

• Polymer electrolyte and ionogel fabrication, benefiting from low viscosity and high ionic mobility.
• Surface modification and functional coatings, where ionic liquids act as non‑volatile, thermally stable processing aids.
• Nanomaterials synthesis, enabling controlled nucleation and growth in ionic environments.

Thermal and Chemical Stability Applications

• Heat‑transfer and thermal‑management fluids in specialized systems requiring non‑volatile, thermally stable media.
• Lubrication additives for extreme environments where ionic liquids improve boundary lubrication and reduce wear.

Separation and Extraction

• Selective extraction of metal ions, supported by the tunable solvation environment of phosphonium‑based ionic liquids.
• Solvent systems for gas absorption, including CO₂ capture research using hydrophobic ionic liquids.

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