Ionic liquids (ILs) due to the trend of ecology and green energy are finding applications in industry and technology. Properties such as low vapour pressure, thermal stability and conductivity, non-volatility and tunability by changing the cation and anion make ILs very attractive systems in modern applications as well for research.
In this study high-resolution Nuclear Magnetic Resonance (NMR) was used to investigate the mixtures of 1-butyl 3-methylimidazolium Chloride [bmim][Cl] in various media. The media was chosen to act as hydrogen bonding donor/ acceptor or as one which does not form hydrogen bonds as well different polarity solvents were investigated. Highly diluted [bmim][Cl] water/ dichloromethane/ acetonitrile/ methanol solutions were investigated by 1H NMR (Fig 1.). The concentration range was from 10-6 to 10-2 molar frequency.
It was found that the 1H chemical shift reaches the plateau at 7.233*10-5/1.809*10-6/2.082*10-6 molar frequency concentrations for water/acetonitrile/methanol, respectively.