Handbook of Solvents - George Wypych - ChemTech - Ventech!

21.2 Ionic liquids 1479
Acidic melts
0.5 0< X ≤ 0.75
c0 c1 c2 c3
a -5.8410 37.009×10 1
b 1.7946×10 -2
-9.0089×10 -2
-56.829×10 1
1.4121×10 -1
30.474×10 1
-7.4099×10 -2
Grätzel et al. 158 has also measured the densities for the different ionic liquids with the
results are shown in Table 21.2.15.
Table 21.2.15. Density at 22 o C or indicated temperature, g cm -3 . TfO - : triflate; NfO - :
nonaflate; Tf 2N - : bis(tryfil)amide; TA - : trifluoroacetate; HB - : heptafluorobutanoate;
AcO - : acetate 158
3-Me
Imidazolium cation TfO -
NfO -
Tf2N -
TA -
HB -
1-Me 1.559
1-Et 1.390 1.520 1.285 1.450
1-Bu 1.290 (20)
1.473 (18)
1.429 (19)
1.209 (21)
1.333
1-i-Bu 1.428 (20)
1-MeOEt 1.364 1.496
1-CF3CH2 1.656 (20)
3-Et
1-Et 1.330 1.452 (21)
1-Bu 1.427 (18)
1.404 (19)
1-Et-2-Me 3-Me 1.495 (21)
1-Et-5-Me
3-Me 1.334 1.470
3-Et 1.432 (23)
1.250
1.183 (23)
As with viscosity, there are some scattered data on density of other ionic liquids which
is summarized in Table 21.2.16, together with the most relevant data from the studies cited
above.
Table 21.2.16. Density of some ionic liquids at 25 o C. For the binary mixtures the ratio
means the proportion of AlX3 to ImX or TMSuX
Cation Anion ρ, gcm -3 at 25 o C
1-ethylpyridinium
1-ethyl-3-methylimidazolium
1-butyl-3-methylimidazolium
Br/AlCl 3 (ratio 2) 1.52 155
Br/AlBr 3 (ratio 2) 2.20 159
Cl/AlCl 3 (ratio 2) 1.39 156
Br/AlBr 3 (ratio 2) 2.22 157
BF 4 1.24 (22 o C) 160
Triflate (CF 3SO 3) 1.38 161
Mesylate (CH 3SO 3) 1.24 161
BF 4 1.17 (30 o C) 162
PF 6 1.37 (30 o C) 162