Thermomorphic phase separation in ionic liquid-organic liquid systems--conductivity and spectroscopic characterization.
Electrical conductivity, FT-Raman and NMR measurements are demonstrated as useful tools to probe and determine phase behavior of thermomorphic ionic liquid-organic liquid systems. To illustrate the methods, consecutive conductivity measurements of a thermomorphic methoxyethoxyethyl-imidazolium ionic liquid/1-hexanol system are performed in the temperature interval 25-80 degrees C using a specially constructed double-electrode cell. In addition, FT-Raman and 1H-NMR spectroscopic studies performed on the phase-separable system in the same temperature interval confirm the mutual solubility of the components in the system, the liquid-liquid equilibrium phase diagram of the binary mixture, and signify the importance of hydrogen bonding between the ionic liquid and the hydroxyl group of the alcohol.
Riisager
Anders
A
Department of Chemistry, Interdisciplinary Research Center for Catalysis (ICAT), Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark. ar@kemi.dtu.dk
Fehrmann
Rasmus
R
Berg
Rolf W
RW
van Hal
Roy
R
Wasserscheid
Peter
P
D045424:Complex Mixtures / Q000032:analysis / Q000737:chemistry*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000379:methods*; D006860:Hydrogen Bonding; D007477:Ions; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry*; D044367:Phase Transition; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000379:methods*
D045424:Complex Mixtures; D007477:Ions; D009930:Organic Chemicals; D012996:Solutions