1-Ethyl-2,3-dimethylimidazolium tetrafluoroborate, CAS: 307492-75-7

Key Applications:

1. Electrochemical Systems

• Electrolytes for supercapacitors and batteries

The 2,3‑dimethyl substitution increases cation rigidity and reduces ring acidity, improving electrochemical stability windows. Paired with BF₄⁻, it supports high ionic conductivity and moderate hydrophobicity, making it suitable for double‑layer capacitors and certain non‑aqueous battery chemistries.

• Electrodeposition media

The ionic liquid can dissolve metal salts and support smooth, uniform electrodeposition of metals such as Cu, Ni, and Ag under water‑free conditions.

2. Catalysis and Reaction Media

• Solvent for Lewis‑acid‑catalyzed transformations

BF₄⁻ can weakly coordinate to metal centers, enabling catalytic systems for alkylation, isomerization, and Friedel–Crafts‑type reactions.

• Medium for organometallic catalysis

The steric bulk around the imidazolium ring reduces unwanted side reactions (e.g., carbene formation), making it a stable medium for Pd, Ru, and Ir catalysts.

• Biphasic catalysis

Its density and immiscibility with some organic solvents allow phase‑separable reaction systems.

3. Separation and Extraction

• Selective extraction of metal ions

BF₄⁻‑based ionic liquids can extract transition‑metal complexes, especially when paired with chelating ligands.

• Gas absorption and separation

Although not as strong as fluorosulfonyl or NTf₂⁻ systems, [EMMIm][BF₄] can absorb SO₂, H₂S, and CO₂ to a moderate extent, useful for screening studies or tunable solvent systems.

4. Materials Processing

• Polymerization media

The ionic liquid can act as a solvent or co‑solvent for radical and cationic polymerizations, improving control over molecular weight distribution.

• Nanomaterial synthesis

Its ionic environment stabilizes nanoparticles (Au, Pt, Fe₃O₄) and can influence particle size and morphology.

5. Spectroscopy and Analytical Chemistry

• Matrix or solvent for electrochemical and spectroscopic studies

Low volatility and good conductivity make it suitable for cyclic voltammetry, impedance spectroscopy, and NMR studies of reactive intermediates.

• Sample preparation

Useful in dispersive liquid–liquid microextraction (DLLME) for hydrophobic analytes.

6. General Solvent and Process Uses

• Non‑volatile replacement for traditional organic solvents

Its stability and low vapor pressure support use in high‑temperature or closed‑system processes.

• Ionic‑liquid‑based lubricants and additives

BF₄⁻ systems can reduce friction and wear in metal–metal interfaces, though NTf₂⁻ salts are more common.

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