Abstract
The Hansen solubility parameters (HSPs) of eight ionic liquids with different combinations of cations and anions were calculated. The Hansen solubility sphere method was used to calculate the HSPs from experimental data on the solubility of the ionic liquids in organic solvents. The double-sphere method rather than the typical single-sphere method was used. In the double-sphere method, the high-polarity side represents an ionic domain and the nonpolar side represents a neutral domain. The value of the center of each sphere is assumed to be the HSP of each domain. Our calculation results confirmed the positions of the double-spheres for each ionic liquid and revealed a dependence on the types of cation and anion.
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