Interaction and microstructure in the binary mixture systems of ionic liquid and acetone by dielectric spectroscopy

Interactions and stabilisation of acetone, sulfur dioxide and water with 1-octyl-3-methylimidazolium tetrafluoroborate [OMIM][BF4] at low temperatures

The interactions between three small molecules, water (H₂O), sulfur dioxide (SO₂) and acetone ((CH₃)₂CO), with the ionic liquid (IL) 1-octyl-3-methylimidazolium tetrafluoroborate, [OMIM][BF₄], have been determined using line of sight temperature programmed desorption (LOSTPD) from a gold surface. Multilayers of the IL were deposited by physical vapour deposition with multilayers of the small molecular species (adsorbed from the gas phase) at 90 K. LOSTPD was then carried out with the small molecular species desorbing first from the mixed multilayer, followed at higher temperatures by desorption of the IL from the gold surface. The IL had a high activation energy for desorption of 126(6) kJ mol^-1. Pure acetone showed a desorption activation energy of 38(2) kJ mol^-1, which increased to 45-61 kJ mol^-1 when it was pre-adsorbed below an overlying porous layer of the ionic liquid at 90 K. The stabilised acetone is thought to be associated with pores containing ionic moieties. Destabilised acetone was also observed and thought to originate from pores containing octyl chains. The quantity of stabilised acetone scaled with the amount of IL, being ≈1.1 molecules per IL ion pair. SO₂ and H₂O were co-adsorbed with the IL at 90 K leading to an intimate mixture of the two. For pure SO₂ the desorption energy was 32(2) kJ mol^-1, which increased to 40-52 kJ mol^-1 for relative concentrations up to 6 SO₂ molecules per IL ion pair. For pure water the activation energies were 49(5) kJ mol^-1 and 43(1) kJ mol^-1 for amorphous and crystalline ice respectively. When co-adsorbed with the IL the stabilisation energies were 42-49 kJ mol^-1, but up to 505 water molecules per IL ion pair could be stabilised to some degree. The desorption mechanisms and the reasons for these interactions are discussed.

Temperature dependent dielectric relaxation of ionic liquid ([bmim][BF4])/alcohol binary mixtures

A dielectric spectroscopy study on the binary mixtures of the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF₄]) and four kinds of alcohols as a function of temperature was carried out over a frequency range of 100 MHz to 20 GHz.