The present project is aimed at a study of fundamental thermophysical properties of pure chiral ionic liquids and their mixtures with commonly used organic solvents in view of their future applications as thermal storage or catalytic reaction media. The investigation of properties 1-[(1R,2S,5R)-(–)-menthoxymethyl]-3-alkylimidazolium bis(trifluoromethanesulfonyl)imides will be carried out both experimentally and by modelling using the soft-SAFT equation of state and the COSMO-RS model.