Trihexyltetradecylphosphonium bis(fluorosulfonyl)imide, CAS: 2253165-55-6

Key Application:

1. Electrochemical Systems

• Non‑volatile electrolyte component for high‑temperature electrochemical devices where thermal stability and low vapor pressure are essential.
• Hydrophobic ionic liquid phase for lithium‑metal and sodium‑metal battery research, particularly in interfacial studies involving FSI⁻ anion decomposition pathways.
• Electrode surface modifiers that tune SEI/CEI formation due to the strong coordinating behavior of the phosphonium cation and the reductively labile FSI⁻ anion.

2. Solvent & Extraction Media

• Hydrophobic extraction phase for metal ions, especially in systems requiring high selectivity for soft or borderline metals.
• Non‑aqueous biphasic systems where the long‑chain phosphonium cation provides strong phase separation and low mutual solubility with water.
• Solvent for organometallic catalysis, particularly for reactions benefiting from ionic microenvironments with low polarity and high thermal stability.

3. Surfactant, Antistatic, and Interfacial Engineering

• Antistatic additive in polymer matrices, coatings, and specialty materials due to the ionic conductivity and hydrophobic tail structure.
• Interfacial modifier in emulsions, dispersions, and nanoparticle stabilization where strong cation–surface interactions are desired.
• Lubrication and tribology applications, leveraging the FSI⁻ anion’s known friction‑reducing properties and the cation’s ability to form durable boundary layers.

4. High‑Temperature & Harsh‑Environment Media

• Heat‑transfer and thermal‑management fluids for niche high‑temperature environments where conventional organics degrade.
• Stable medium for high‑temperature spectroscopy, kinetics, and reaction monitoring, especially when water‑free conditions are required.
• Carrier fluid for reactive species in environments involving strong acids, Lewis acids, or oxidative conditions where phosphonium ILs outperform ammonium analogs.

5. Materials Processing & Advanced Manufacturing

• Plasticizer or processing aid for high‑performance polymers, improving flexibility, conductivity, or melt behavior.
• Additive in ion-conductive composites, including polymer electrolytes and hybrid organic–inorganic materials.
• Template or structure‑directing agent in nanoporous materials, carbon materials, and inorganic frameworks.

6. Safety, Stability & Specialty Uses

• Non‑flammable solvent replacement in applications where safety and regulatory compliance require low volatility.
• Ionic liquid matrix for spectroscopic and analytical methods (e.g., Raman, NMR) where low background and high thermal stability are advantageous.
• Hydrophobic immobilization medium for enzymes or catalysts requiring non‑aqueous, low‑polarity environments.

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