conductivity measurements were made for three of the roomtemperature ionic liquids (RTILs). The crystalstructures 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
使用我们之前报道的 QA 卤化物作为前体,通过复分解制备了八种具有双(三氟甲磺酰基)亚胺(TFSI)阴离子的新型单阳离子季铵(QA)盐。使用 1 H 和 13 C NMR 技术、质谱和元素分析以及 X 射线衍射和热分析方法对液态和固态的新盐进行了表征。此外,还对三种室温离子液体 (RTIL) 进行了残留水含量、粘度和电导率测量。三种化合物的晶体结构通过X射线单晶衍射测定。粉末衍射用于研究固体盐的结晶度并比较单晶和微晶散装粉末之间的结构相似性。其中三种盐在室温以下为液态,具有较宽的液体范围 (± 300 C),八种盐中的五种在 100 C 以下熔化。此外,两种 RTIL 的粉末衍射数据能够在低于在室温下使用原位低温粉末 X 射线衍射显示两种 RTIL 在其凝固点以下具有高结晶度。RTIL 具有相对较高的电导率(≤ 0.1–0.2 S m ≤ 1)和中等至相对较低的粘度。所报告的离子液体的物理
Preparation and characterization of new low melting ammonium-based ionic liquids with ether functionality
作者:Minna Kärnä、Manu Lahtinen、Jussi Valkonen
DOI:10.1016/j.molstruc.2009.01.041
日期:2009.3
synthesized by metathesis reaction between a prepared QA bromide and HBF4 or KPF6. The crystalstructures of four compounds were determined by X-ray single crystal diffraction and powder diffraction was used to study the crystallinity of the solid compounds and to compare the structural similarities between the single crystals and the microcrystalline bulk form. Thermal properties of all compounds were studied