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Ionic Liquids

Imidazolium, pyridinium and ammonium ionic liquids with triflimide, chloride and methyl sulphate anions for green chemistry, electrochemistry and separations.
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Ionic liquids are salts that melt below 100 °C, and their negligible vapour pressure and tunable polarity make them useful solvents, electrolytes and extraction media. This sub-category covers imidazolium salts with many anion and side-chain combinations, such as 1,2-Dimethyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide, 1,3-Bis(cyanomethyl)imidazolium chloride and 1,2,3-Trimethylimidazolium methyl sulfate, along with pyridinium and quaternary ammonium types.

The anion largely sets the physical behaviour. Triflimide salts are hydrophobic, low in viscosity and stable over a wide electrochemical window. Chlorides and methyl sulphates are hydrophilic and dissolve cellulose and other biopolymers. Water and halide content have a strong effect on conductivity and catalysis, so check these values for electrochemical work.

Ionic liquids are supplied in sealed glass bottles, often packed under dry nitrogen. Store them tightly closed, since many are hygroscopic. Every lot carries a COA with purity by HPLC or NMR and, where tested, the water content.

Ionic Liquids: questions buyers ask

Why does water content matter in an ionic liquid?
Even small amounts of water lower viscosity, change conductivity and narrow the electrochemical window. Water can also hydrolyse some anions or interfere with catalytic reactions. For battery or electrochemistry studies, dry the liquid under vacuum before use and handle it in a glovebox, then confirm the residual level by Karl Fischer titration.
How do I choose between a hydrophobic and a hydrophilic ionic liquid?
Start from the application. Hydrophobic types such as triflimide salts suit biphasic extraction from water, electrolytes and moisture-free reactions. Hydrophilic types such as chlorides and acetates dissolve polar solutes, sugars and cellulose. The cation's side chain fine-tunes melting point and viscosity within each group.
Can ionic liquids be recycled after a reaction?
Many can be recovered by extracting the product with an immiscible organic solvent and then drying the ionic liquid under vacuum. Performance may fall slowly as impurities accumulate, so check purity between cycles. Recycling is one of the main reasons ionic liquids are considered for greener process design.

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