1-Hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide CAS 916729-96-9

1-Hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide

Description:

1-Hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, also widely known by its abbreviation [HMIM][TFSI] or [HMIM][NTf₂], is a hydrophobic ionic liquid (IL) highly regarded for its exceptional electrochemical and thermal stability. This organic salt is a liquid at room temperature and possesses low volatility, low viscosity (for an ionic liquid), and good conductivity. The bis(trifluoromethanesulfonyl)imide anion contributes significantly to its desirable properties, including its resistance to hydrolysis and wide electrochemical window. These characteristics make [HMIM][TFSI] a prime candidate for demanding applications such as high-performance electrolytes in batteries and supercapacitors, lubricants, and as a non-coordinating, highly stable solvent in various chemical processes and analytical techniques.

Properties:

Property	Value
Product Name	1-Hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide
CAS Number	916729-96-9
Chemical Formula	C12​H19​F6​N3​O4​S2​
Molecular Weight	447.42 g/mol
Appearance	Typically a colorless to pale yellow, clear liquid
Synonyms	[HMIM][TFSI], [HMIM][NTf₂], 1-Hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
Type	Ionic Liquid, Imidazolium Salt
Density	Approximately 1.43 – 1.44 g/cm³ (varies with temperature and purity)
Melting Point	Typically below 0 °C
Solubility	Immiscible with water; soluble in many organic solvents
Thermal Stability	Very high, often stable up to 350-450 °C
Electrochemical Window	Wide, making it excellent for electrochemical applications
Viscosity	Relatively low for an ionic liquid
Primary Applications	Electrolyte, Solvent, Lubricant, Ion Exchange Medium

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