Vaporization of protic ionic liquids studied by matrix-isolation Fourier transform infrared spectroscopy.
J Phys Chem A
; 118(18): 3280-7, 2014 May 08.
Article
em En
| MEDLINE
| ID: mdl-24724531
ABSTRACT
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.
Texto completo:
1
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article