1-Hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, CAS: 382150-50-7

Key Applications:

1. Gas Separation and CO₂ Capture

CO₂ Selective Solvent

• The long C6 alkyl chain increases free volume and enhances CO₂ solubility relative to shorter‑chain imidazolium ILs.
• The TFSI⁻ anion provides high fluorination, which strengthens quadrupole interactions with CO₂, improving absorption capacity.
• Suitable for physical absorption processes, membrane‑supported IL phases, and hybrid IL–polymer systems.
• Ultra‑high purity (>99.5%) ensures reproducible solubility data, critical for modeling and scale‑up in carbon capture R&D.

Supported Ionic Liquid Membranes (SILMs)

• High hydrophobicity and low vapor pressure minimize IL loss during long‑term CO₂/N₂ or CO₂/CH₄ separation.
• Stability under pressure differentials makes it attractive for pilot‑scale membrane modules.

2. Adsorption and Surface‑Mediated Processes

Surface Functionalization and Tunable Adsorption

• Acts as a surface modifier for porous carbons, silica, and metal–organic frameworks (MOFs), improving CO₂ affinity and selectivity.
• The C6 chain enhances dispersibility on hydrophobic surfaces, enabling uniform IL coatings.
• High purity reduces interference from trace halides or moisture, which can alter adsorption isotherms.

Ion‑Pair–Driven Adsorption Studies

• Used as a benchmark IL for studying ion–surface interactions, wettability, and adsorption kinetics in advanced materials research.
• Supports development of IL‑gated electrodes and IL‑modified sorbents.

3. Solvent and Reaction Medium

Non‑Volatile, Thermally Stable Solvent

• Ideal for moisture‑sensitive or high‑temperature reactions due to its wide electrochemical and thermal stability windows.
• Commonly used in organometallic catalysis, transition‑metal complex stabilization, and biphasic catalysis.

Solvent for Electrochemical and Spectroscopic Studies

• High ionic conductivity and low viscosity (relative to longer‑chain ILs) make it suitable for electrochemical measurements.
• Ultra‑high purity minimizes background signals in NMR, FTIR, and UV‑Vis studies.

4. Energy Storage and Electrolyte Systems

Lithium Battery Electrolytes

• TFSI⁻ anion provides excellent electrochemical stability and compatibility with Li salts.
• Used in Li‑ion, Li‑metal, and solid‑state battery research as a co‑solvent or primary electrolyte component.
• High purity reduces degradation pathways that shorten cycle life.

Supercapacitors and Ionic‑Liquid‑Based EDLCs

• High voltage stability supports wide electrochemical windows for high‑energy supercapacitors.
• Low volatility ensures safe operation under elevated temperatures.

5. Materials Processing and Nanotechnology

Nanoparticle Synthesis and Stabilization

• Serves as a templating medium for metal, metal oxide, and carbon nanostructures.
• Hydrophobicity and ion‑pair structure influence particle morphology and dispersion.

Polymer Processing

• Acts as a plasticizer or processing aid for fluoropolymers and high‑performance engineering plastics.
• Enhances ionic conductivity in polymer electrolytes.

6. Tribology and Lubrication

• Hydrophobic, thermally stable IL used as a boundary lubricant for steel, aluminum, and ceramic interfaces.
• Reduces wear and friction under high load due to strong surface adsorption of the imidazolium cation.

7. Analytical and Benchmark Uses

• High‑purity (>99.5%) grade is preferred for fundamental thermodynamic, viscosity, and conductivity measurements.
• Used as a reference IL in computational chemistry, MD simulations, and equation‑of‑state validation.

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