Vaporization of protic ionic liquids studied by matrix-isolation Fourier transform infrared spectroscopy.
Several protic ionic liquids (PILs) with a wide range of pK(a) differences (ΔpK(a)) between the parent acid and base molecules were thermally evaporated in vacuum, trapped on a CsI plate by a cryogenic neon matrix-isolation method, and studied by Fourier transform infrared spectroscopy and density functional theory calculations. The parent neutral molecules and proton-transferred cation-anion pair species were identified as chemical components evaporated from the PILs with lower and higher ΔpK(a) values, respectively. The ΔpK(a)-dependent vaporization mechanism is discussed in terms of thermodynamic equilibrium between acid-base and anion-cation systems in the liquid phase.
Graduate School of Bio-Applications and Systems Engineering (BASE), Tokyo University of Agriculture and Technology , 2-24-16, Naka-cho, Koganei, Tokyo, 184-8588, Japan.
Mami
M
Horikawa
Nobuyuki
N
Akai
Akio
A
Kawai
Kazuhiko
K
Shibuya