Ionic Liquids Based upon Metal Halide/Substituted Quaternary Ammonium Salt Mixtures

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• 作者：Andrew P. Abbott ; Glen Capper ; David L. Davies ; and Raymond Rasheed
• 刊名：Inorganic Chemistry
• 出版年：2004
• 出版时间：May 31, 2004
• 年：2004
• 卷：43
• 期：11
• 页码：3447 - 3452
• 全文大小：78K
• 年卷期：v.43,no.11(May 31, 2004)
• ISSN：1520-510X

文摘

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 quaternaryammonium 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 basicsolutions. Similar results were observed for ionic liquids containing SnCl₂. The surface tension was also measuredand was used to explain the high viscosity of the ionic liquids in terms of the large ion:hole size ratio and the smallprobability of finding a hole of suitable dimensions adjacent to a given ion to permit movement. The phase behaviorof a variety of quaternary ammonium halides/ZnCl₂ mixtures is characterized and it is shown that the depressionof freezing point is related to the increase in size of the component ions.