Water content and related physical properties of aliphatic quaternary ammonium imide-type ionic liquid containing metal ions
Water content and related physical properties of aliphatic quaternary ammonium imide-type ionic liquid containing metal ions
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DOI：
10.1016/j.stam.2006.02.017
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发表时间：
2006-09-01
影响因子：
5.5
通讯作者：
Awakura, Yasuhiro
中科院分区：
文献类型：
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作者：
Katase, Takuma;Imashuku, Susumu;Awakura, Yasuhiro
离子液体三甲基正己基铵双((三氟甲基)磺酰基)酰胺(TMHA-Tf2N)具有超过5V的宽电化学窗口，并且由于其Tf2N-阴离子中的两个-CF3基团而被认为是疏水性的。然而，即使在真空脱水后，离子液体中仍残留有少量的水，这在使用离子液体作为溶剂时导致金属电沉积中的一些问题。我们测量了含有 M(Tf2N)(n)（M = H、Li、Mg、Ni、Cu、Zn、La 和 Dy；n = 1、2 或 3）的离子液体 TMHA-Tf2N 的水含量，以及它们在 25-130 ℃ 温度范围内的运动粘度和电导率。此外，对这些离子液体进行了差示扫描量热法，以确定其玻璃化转变温度、结晶度温度和熔化温度。含有M(Tf2N)(n)盐的TMHA-Tf2N的水含量随着温度的升高而降低。同时，运动粘度降低，电导率增加。通过测量光学吸收光谱，发现TMHA-Tf2N中的金属离子发生了水合。在TMHA-Tf2N中添加M(Tf2N)(n)后，恒温水含量增加，导致运动粘度略有增加，电导率略有下降。在不同温度和含水量下测量的电导率与运动粘度的类似瓦尔登图，给出了一条直线。 (c) 2006 NIMS 和 Elsevier Ltd. 保留所有权利。
The ionic liquid, trimethyl-n-hexylammonium bis((trifluoromethyl)sulfonyl)amide (TMHA-Tf2N), has a wide electrochemical window of more than 5 V and is considered to be hydrophobic because of two -CF3 groups in its Tf2N- anion. However, a small amount of water remains in the ionic liquid even after dehydration in vacuo, which causes some problems in metal electrodeposition when using the ionic liquid as a solvent. We measured the water content of the ionic liquids, TMHA-Tf2N containing M(Tf2N)(n) (M = H, Li, Mg, Ni, Cu, Zn, La, and Dy; n = 1, 2, or 3), as well as their kinematic viscosity and electrical conductivity in the temperature range of 25-130 degrees C. Furthermore, differential scanning calorimetry was performed for these ionic liquids to find their glass transition temperature, crystallization temperature, and melting temperature. The water content of TMHA-Tf2N containing M(Tf2N)(n) salts decreased with an increase in temperature. At the same time, the kinematic viscosity decreased and the electrical conductivity increased. By measuring the optical absorption spectrum, it was found that the metal ions in TMHA-Tf2N were hydrated. The addition of M(Tf2N)(n) to TMHA-Tf2N, increased the water content at a constant temperature, which resulted in slight increases in the kinematic viscosity and decrease in the electrical conductivity. A Walden-like plot of the electrical conductivities against the kinematic viscosities, measured over various temperatures and water contents, gave a single straight line. (c) 2006 NIMS and Elsevier Ltd. All rights reserved.