Chemistry Organic Building Blocks Bis (trifluoromethylsulfonyl) imines
Bistriflimide, which is also referred to by various names including bis(trifluoromethane)sulfonimide, bis(trifluoromethanesulfonyl)amide, bis(trifluoromethanesulfonyl)imidate (as well as similar variations), is commonly called triflimide or triflimidate, although these terms are somewhat informal and not entirely accurate. Another way to refer to it is by the abbreviations TFSI or NTf2. This non-coordinating anion has the chemical formula [(CF3SO2)2N]−, and its salts are typically known as metal triflimidates.
Due to its superior stability and reduced toxicity compared to more "conventional" counterions like tetrafluoroborate, Bistriflimide finds extensive application in ionic liquids like trioctylmethylammonium bis(trifluoromethylsulfonyl)imide.
Bistriflimide is also of importance in lithium-ion and lithium metal batteries (LiTFSI) because of its high dissociation and conductivity. It has the added advantage of suppressing crystallinity in poly(ethylene oxide), which increases the conductivity of that polymer below its melting point at 50 °C.
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N,N-Dibutyl-N-methylbutan-1-aminium bis((trifluoromethyl)sulfonyl)amide
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TRibutylmethylphosphonium bis(trifluoromethanesulfonyl)imide
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Tributyl(2-methoxyethyl)phosphonium bis(trifluoromethanesulfonyl)imide