Room temperature ionic liquids: Different classes and physical properties

Room temperature ionic liquids (RTILs) are a rapidly growing area of chemistry. Although much of the interest has been focussed on the applications of these materials, there has also been significant effort directed toward extending the range of types of these materials. Unfortunately, information about the physical properties of these compounds is often poorly reported and difficult to find. The purpose of this review is partially to collect this information (to aid those considering using RTILs) and partially to encourage those working in this area to be more thorough in their reporting of the physical properties of these unique materials.