Development of low viscous ionic liquids: the dependence of the viscosity on the mass of the ions

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• 作者：Peter Barthen (1)
  Walter Frank (1)
  Nikolai Ignatiev (2)
  
  1. Institut f眉r Anorganische Chemie und Strukturchemie ; Heinrich-Heine-Universit盲t D眉sseldorf ; Universit盲tstr. 1 ; 40225 ; D眉sseldorf ; Germany
  2. Merck KGaA ; PM 鈥?ATI ; Frankfurter Strasse 250 ; 64293 ; Darmstadt ; Germany
  
• 关键词：Ionic liquids ; Viscosity ; Density ; Deuterated ionic liquids ; Diffusion
• 刊名：Ionics
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：21
• 期：1
• 页码：149-159
• 全文大小：396 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760

文摘

Straightforward syntheses of selected non-deuterated, partially deuterated, and fully deuterated room temperature ionic liquids (ILs) with the anions tris(pentafluoroethyl)trifluorophosphate, tetracyanoborate, and methyl sulfate were developed. The viscosity and the density of these ionic liquids were measured at various temperatures. The dissociation rate of the ionic liquid, the sizes of the cation and the anion, and the nature of the inter-ionic interaction are not influenced by deuteration, but viscosity is. All deuterated ionic liquids possess a higher viscosity and density in comparison to non-deuterated ones. The explanation of this phenomenon is given and discussed based on the modified Stokes-Einstein equation with a parameter which reflects the mass of the diffused particles. This new knowledge supports the recent development of novel low viscous inert ionic liquids which are of particular interest for the application in energy conversion devices. Deuterated ionic liquids are valuable media for the investigation of chemical reactions, natural products, and bio-materials by means of the NMR spectroscopy.