期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 983, 期 1-3, 页码 82-92出版社
ELSEVIER
DOI: 10.1016/j.molstruc.2010.08.036
关键词
Quaternary ammonium salt; Bis(trifluoromethanesulfonyl)imide (TFSI); Ionic liquids; Thermal analysis; X-ray diffraction; Physicochemical properties
资金
- Inorganic Materials Chemistry Graduate Program
Eight new monocationic quaternary ammonium (QA) salts with the bis(trifluoromethanesulfonyl)imide (TFSI) anion were prepared by metathesis using our previously reported QA halides as precursors. New salts were characterized both in liquid and solid state using H-1 and C-13 NMR techniques, mass spectroscopy and elemental analysis together with X-ray diffraction and thermoanalytical methods. In addition, residual water content, viscosity and conductivity measurements were made for three of the room-temperature ionic liquids (RTILs). The crystal structures of three compounds were determined by X-ray single crystal diffraction. Powder diffraction was used to study the crystallinity of the solid salts and to compare structural similarities between the single crystals and the microcrystalline bulk powders. Three of the salts are liquid below room temperature, having broad liquid ranges (similar to 300 degrees C), and in total five out of eight salts melt below 100 degrees C. Moreover, powder diffraction data of the two RTILs were able to be measured at sub-ambient temperatures using in situ low-temperature powder X-ray diffraction revealing high crystallinity on both RTILs below their freezing point. The RTILs presented relatively high conductivities (similar to 0.1-0.2 S m(-1)) and moderate to relatively low viscosities. The determined physicochemical properties of the reported ILs suggest their applicability on various applications such as heat transfer fluids, high temperature synthesis and lubricants. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据