6533b7d7fe1ef96bd1267c46

RESEARCH PRODUCT

Properties of new asymmetrically quaternized dicationic ammonium based room-temperature ionic liquids with ether functionality

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description

Eleven asymmetrically quaternized dicationic ammonium-based room-temperature ionic liquids (DRTILs) with bis(trifluoromethanesulfonyl)imide (TFSI) were synthesized and characterized, along with 11 analogous dibromide precursors. Two-step synthesis was used to diquaternize tetramethyl-1,3-propanediamine and 2-(dimethylamino)-ethyl ether amines with a variety of alkyl and ether functionalized side chain groups (R1 ≠ R2). Each salt contain 1 to 3 ether groups located either in a linkage or in a side chain moieties. Structural and thermoanalytical properties, water content, and viscosity have been characterized using, for example, NMR, mass spectrometry (MS), X-ray diffraction, and thermal analysis (TG/DTA, DSC). DRTILs have extensive fluid ranges [(∼330 to 370) °C], which are the consequence of low glass transition [(−60 to −40) °C] and high thermal degradation temperatures of the salts [(279 to 325) °C; heating rate 1.25 °C·min–1]. Thermal stabilities of DRTILs were examined as a function of a heating rate ...