The nature of ionic liquids in the gas phase.
Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) experiments showed that when aprotic ionic liquids vaporize under pressure and temperature conditions similar to those of a reduced-pressure distillation, the gas phase is composed of discrete anion-cation pairs. The evolution of the mass spectrometric signals recorded during fractional distillations of binary ionic liquid mixtures allowed us to monitor the changes of the gas-phase composition and the relative volatility of the components. In addition, we have studied a protic ionic liquid, and demonstrated that it exists as separated neutral molecules in the gas phase.
Leal
João P
JP
Departamento de Química, Instituto Tecnológico e Nuclear, 2686-953 Sacavém, Portugal.
Esperança
José M S S
JM
da Piedade
Manuel E Minas
ME
Lopes
José N Canongia
JN
Rebelo
Luís P N
LP
Seddon
Kenneth R
KR