"Organohalogen compounds are key materials in chemical, medicinal, agrochemical, and material sciences. They can also be used as basis for alternative reaction or extraction schemes due to their poor miscibility with both hydrocarbons and water. Hence, it is of great importance to develop environmentally benign selective halogenated systems. One of the key-issues concerning the current importance of ionic liquids is the fact that they can simultaneously act as sophisticated solvation or reaction media while avoiding dramatic impacts in the environment due to their general negligible volatility and non-flammability. Their ability to dissolve a wide range of compounds and their ionic nature provides new ways to carry out chemical reactions or industrial separations with enhanced yields. Following these trends it is of great importance to develop neoteric ionic liquids with halogenated alkyl chains that can boost their application into new research areas. Two main objectives are pursued on this project. On one hand these news ionic liquids can induce a breakthrough on ionic liquids research by the formation of three nanosegregated domains (polar, apolar and halogenated) with improved extraction properties. Understanding at a molecular level their nature and interactions can drive this research project a step forward into the industrial application of these compounds. On the other hand, the introduction of halogenated atoms on specific positions of the resonance ring of the imidazolium cation of an ionic liquid can induce lower viscosity, lower melting point, lower enthalpies of vaporization and higher vapor pressures compared to the already available ionic liquids. Fulfilling this objective eases the determination of energetic properties of ionic liquids, with more precise results that can be used to validate the simulation models developed and contribute to the implementation of more reliable predictive tools."