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Aqueous Biphasic Systems with Ionic Liquids
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Figure 9. Cation alkyl chain length influence in the water, a), and ILs, b), mutual solubilities: ○,
[C1mim][Tf2N]; ×, [C2mim][Tf2N] 35 ; , [C3mim][Tf2N] 35 ; , [C4mim][Tf2N] 35 ; +,
[C5mim][Tf2N] 35 .
When analyzing Figure 9, increasing the IL alkyl chain length it decreases the solubility of
water in ILs and vice-versa. Indeed, these results are consistent with the experimental data
previously reported 35, 41 .
The difference in the mutual solubilities between water and different ILs isomers
([C2C2im][Tf2N], [C3mim][Tf2N], [C4C1mim][Tf2N] and [C5mim][Tf2N]) is shown in
Figure 10.
18
x water
0.45
0.40
0.35
0.30
0.25
0.20
0.15
285 290 295 300 305 310 315 320
T / K
0.0020
a) b)
x IL
0.0016
0.0012
0.0008
0.0004
0.0000
285 290 295 300 305 310 315 320
T / K