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Ionic liquids (ILs) are a class of chemical compounds composed entirely of ions that melt at temperatures below 100°C and exhibit interesting properties such as low volatilities and high thermal stability. The low volatilities of ILs mean that when compared to traditional solvents, ILs are less likely to volatilize which directly translates to lowered risk of emissions. The high thermal stability of ILs signify that the compounds should be able to withstand high temperatures for extended periods of time without decomposition. These two properties together make for an enabling technology that opens doors for other types of advancements, one being the study of heat transfer fluids with high energy storing capabilities. Unfortunately, the temperatures at which most ILs decompose is lower than the temperature at which most heat transfer fluids would need to reach to be industrially practical. The goal of this study is to develop thermally robust ILs with phosphonium cations which have shown to have superior thermal stability and to further enhance those interesting properties of ILs by saturating them with molecular aromatics. The metrics that determine whether the addition of the aromatic species to an IL is successful in improving the standalone IL are the melting point, decomposition point, heat of fusion, entropy of fusion and heat capacity; these are measured using differential scanning calorimetry and thermal-gravimetric analysis. In this work, we examine these properties of several IL/ aromatic mixtures.