1-allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide CAS 655249-87-9  

Description

1-Allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, also known as [AMIM][TFSI] or AllylMIM NTf₂, is an ionic liquid with the CAS number 655249-87-9. This compound consists of a 1-allyl-3-methylimidazolium cation and a bis(trifluoromethanesulfonyl)imide anion. It is recognized for its favorable physicochemical properties, including high thermal stability, low volatility, high ionic conductivity, and good electrochemical stability. These characteristics make it a versatile material in various advanced applications, particularly in electrochemistry and as a specialized solvent. It is typically a liquid at room temperature and may require storage under inert gas and cool, dark conditions due to its hygroscopic nature.

Properties

Property	Value
CAS Number	655249-87-9
Molecular Formula	C9​H11​F6​N3​O4​S2​
Molecular Weight	$\approx 403.31\text{ g/mol}$
Appearance	Colorless to light orange/yellow clear liquid
Purity	Typically $\geq$98.0% to >99% (HPLC)
Density	≈1.494 g/cm3 (at 29 °C)
Viscosity	$\approx 35\text{ cP (at 25 °C)}$
Melting Point	<25 °C
Refractive Index	$\approx 1.43$
Electrochemical Window	$\approx 4.8\text{ V}$
Ionic Conductivity	High; for example, $8.871\text{ mS/cm (at 30 °C)}$
Storage	Room temperature (recommended <15°C), under inert gas, keep dry, avoid light
Synonyms	AllylMIM TFSI, AllylMIM NTf₂, [AMIM][NTf₂], AMIMTFSI, AllylMIM BTA, AllylMIM BTI
Key Characteristics	High thermal stability, low volatility, high ionic conductivity, hygroscopic

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