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Low-Melting, Low-Viscous, Hydrophobic Ionic Liquids: Aliphatic Quaternary Ammonium Salts with Perfluoroalkyltrifluoroborates Zhi-Bin Zhou, Hajime Matsumoto,* and Kuniaki Tatsumi[a] ductivity, thermal and electrochemical Abstract: A novel class of low-melting, kyltrifluoroborate ([R BF ] ) anion on F 3 hydrophobic ionic liquids based on rel- stability, have been determined and the above physicochemical properties atively small aliphatic quaternary am- comparatively studied with those based is discussed. Most of these salts are liq- monium cations ([R1 2 3 + on the corresponding [BF uids at 25 8C and exhibit low viscosities R R NR] , where- 4] and in R1 2 3 [(CF (58–210 cP at 25 8C) and moderate con- , R , R = CH or C H , R = n- SO ) N] salts. The influence of 3 2 5 3 2 2 C H , n-C H , CH CH OCH ) and per- the structure variation in the quaterna- ductivities (1.1–3.8 mS cm1). The elec- 3 7 4 9 2 2 3 fluoroalkyltrifluoroborate anions ry ammonium cation and perfluoroal- trochemical windows of these salts are ([R BF ] , R = CF , C F , n-C F , n- much larger than those o