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Title: Interactions between water and 1-butyl-1-methylpyrrolidinium ionic liquids

We report experimental results on the diffusivity of water in two ionic liquids obtained using the pulsed-gradient spin-echo NMR method. Both ionic liquids have the same cation, 1-butyl-1-methylpyrrolidinium, but different trifluoromethyl-containing anions. One has a strongly hydrophobic anion, bis(trifluoromethylsulfonyl)amide, while the second has a hydrophilic anion, trifluoromethylsulfonate. Transport of water in these ionic liquids is much faster than would be predicted from hydrodynamic laws, indicating that the neutral water molecules experience a very different friction than the anions and cations at the molecular level. Temperature-dependent viscosities, conductivities, and densities are reported as a function of water concentration to further analyze the properties of the ionic liquid-water mixtures. These results on the properties of water in ionic liquids should be of interest to researchers in diverse areas ranging from separations, solubilizing biomass and energy technologies.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [2] ;  [4]
  1. Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854 (United States)
  2. CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand, BP 80026, F-63171 Aubière (France)
  3. (France)
  4. Department of Physics and Astronomy, Hunter College, CUNY, New York, New York 10065 (United States)
Publication Date:
OSTI Identifier:
22493510
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 143; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANIONS; BIOMASS; CATIONS; CONCENTRATION RATIO; DENSITY; FRICTION; LIQUIDS; MIXTURES; MOLECULES; MOLTEN SALTS; NUCLEAR MAGNETIC RESONANCE; PYRROLIDINES; SPIN ECHO; TEMPERATURE DEPENDENCE; VISCOSITY; WATER