Ionic liquids based upon metal halide/substituted quaternary ammonium salt mixtures
Ionic liquids based upon metal halide/substituted quaternary ammonium salt mixtures
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DOI：
10.1021/ic049931s
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发表时间：
2004-05-31
影响因子：
4.6
通讯作者：
Rasheed, R
中科院分区：
文献类型：
--
作者：
Abbott, AP;Capper, G;Rasheed, R
展示了基于功能化的季铵盐和锌、锡或铁的金属盐的离子液体的合成。研究了这些离子液体的凝固点与季铵盐阳离子的关系。用质谱仪和电位法对络合阴离子进行了鉴定和定量。结果表明，在更多的Lewis碱性溶液中，主要的锌阴离子是Zn2Cl5-随着Zn3Cl7含量的增加而变得更加丰富。含有SnCl2的离子液体也观察到了类似的结果。还测量了表面张力，并用它解释了离子液体的高粘度，这是因为离子与孔的大小比大，以及在给定离子附近找到合适尺寸的孔以允许移动的可能性很小。对各种季铵盐/氯化锌混合物的相行为进行了表征，结果表明，凝固点的降低与组成离子尺寸的增大有关。
The synthesis of ionic liquids based upon functionalized quaternary ammonium salts and metal salts of zinc, tin, or iron is demonstrated. The freezing point of these ionic liquids was studied as a function of the quaternary ammonium cation. The complex anions were identified and quantified using mass spectrometry and potentiometry. It is shown that the primary zinc anion is Zn2Cl5- with Zn3Cl7- becoming more abundant in more Lewis basic solutions. Similar results were observed for ionic liquids containing SnCl2. The surface tension was also measured and was used to explain the high viscosity of the ionic liquids in terms of the large ion:hole size ratio and the small probability of finding a hole of suitable dimensions adjacent to a given ion to permit movement. The phase behavior of a variety of quaternary ammonium halides/ZnCl2 mixtures is characterized and it is shown that the depression of freezing point is related to the increase in size of the component ions.