Nishi Naoya, Imakura Seiichi, Kakiuchi Takashi
Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.
Anal Chem. 2006 Apr 15;78(8):2726-31. doi: 10.1021/ac052152o.
Ionic liquids composed of a hydrophobic anion, tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (TFPB-), and various aromatic and aliphatic ammonium have been prepared. TFPB salts of N-octadecylisoquinolinium (C18Iq+) and trioctylmethylammonium (TOMA+) show low melting points of 31 and 36 degrees C, respectively, whereas TFPB-based ionic liquids of 1-alkyl-3-methylimidazolium with the alkyl chain length of 5-12 show melting points lower than 90 degrees C. The [C(18)Iq][TFPB]|water (W) and [TOMA][TFPB]|W interfaces have the polarized potential window (ppw) of 0.8 V at 56 degrees C, which is twice as wide as the ppw at the interface between W and room-temperature ionic liquids of bis(perfluoroalkylsulfonyl)imide so far reported. The extension of the ppw by more than 0.4 V to the positive direction enables voltammetric measurements of the ion transfer of relatively hydrophobic anions such as bis(trifluoromethylsulfonyl)imide and bis(pentafluoroethylsulfonyl)imide and of hydrophilic cations such as tetraethylammonium and acetylcholine ions.
由疏水性阴离子四[3,5 - 双（三氟甲基）苯基]硼酸盐（TFPB-）与各种芳香族和脂肪族铵组成的离子液体已被制备出来。N-十八烷基异喹啉鎓（C18Iq+）和三辛基甲基铵（TOMA+）的TFPB盐分别显示出31℃和36℃的低熔点，而烷基链长度为5 - 12的1-烷基-3-甲基咪唑鎓的基于TFPB的离子液体显示出低于90℃的熔点。[C(18)Iq][TFPB]|水（W）和[TOMA][TFPB]|W界面在56℃时具有0.8V的极化电位窗口（ppw），这是迄今为止报道的W与双（全氟烷基磺酰）亚胺室温离子液体之间界面处ppw的两倍。ppw向正方向扩展超过0.4V能够对相对疏水性阴离子如双（三氟甲基磺酰）亚胺和双（五氟乙基磺酰）亚胺以及亲水性阳离子如四乙铵和乙酰胆碱离子的离子转移进行伏安测量。
