Wide electrochemical window at the interface between water and a hydrophobic room-temperature ionic liquid of tetrakis[3,5-bis(trifluoromethyl)phenyl]borate.
Wide electrochemical window at the interface between water and a hydrophobic room-temperature ionic liquid of tetrakis[3,5-bis(trifluoromethyl)phenyl]borate.
复制标题
DOI：
10.1021/ac052152o
复制
发表时间：
2006-03
影响因子：
7.4
通讯作者：
Naoya Nishi;Seiichi Imakura;T. Kakiuchi
中科院分区：
文献类型：
--
作者：
Naoya Nishi;Seiichi Imakura;T. Kakiuchi
已经制备了由疏水性阴离子、四[3,5-双(三氟甲基)苯基]硼酸盐(TFPB-)以及各种芳香族和脂肪族铵组成的离子液体。 N-十八烷基异喹啉鎓 (C18Iq+) 和三辛基甲基铵 (TOMA+) 的 TFPB 盐分别表现出 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 TFPB 基离子液体的熔点低于 90 ℃。 [C(18)Iq][TFPB]|水(W)和[TOMA][TFPB]|W界面在56℃下的极化电位窗口(ppw)为0.8 V，是迄今为止报道的W与双(全氟烷基磺酰基)亚胺室温离子液体之间界面的ppw的两倍。 ppw 向正方向延伸超过 0.4 V，能够对相对疏水性阴离子（例如双（三氟甲基磺酰基）亚胺和双（五氟乙基磺酰基）亚胺）和亲水性阳离子（例如四乙基铵和乙酰胆碱离子）的离子转移进行伏安测量。
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.