ABSTRACT
Ionic liquids have turned out to be curious class of compound having unique combination of properties, such as being liquids at room temperature, undetectable vapor pressure, higher thermal stability, nonflammability, and interesting solubility trends. Further, all of physical features like polarity, solubility, miscibility, viscosity, boiling, and melting points can be tuned or adjusted as per requirement of applications through simple variation in its structure. In addition, ionic liquids are recyclable, thus avoiding the generation of chemical waste and thus are termed as "green solvents". Recycling is especially beneficial both economically and environmentally in the case of ionic liquid supported catalytic system. Ionic liquids, being an unusual liquid with an unprecedented bunch of properties became focus of attention for exploration of its application. The positive outcome of this methodology has triggered the ever increasing growth in the field of task-specific ionic liquids. Pyridinium-ionic liquids can serve as a suitable substitute to prevent such drawbacks associated with use of imidazolium-based ionic liquids.
