. 2009 Mar 18;10(3):1271–1289. doi: 10.3390/ijms10031271

Table 3.

Water solubility at temperatures within 293.15 ± 5 K and cation hydrophobicity. Data without source attribution are published here for the first time. Data with a mole fraction solubility greater than 0.05 are not considered, because this would conflict with Assumptions 1 and 2 stated in the text. Data from Branco et al. [20] were not considered as they strongly diverge from other sources for an unknown reason.

	Cation hydrophobicity		IL water solubility
Cation^[a]	log k_0,c	Anion^[b]	${log}_{10} x_{IL, w}^{sat}$	T [K]
IM16	1.2 [14]	(C₂F₅)₃PF₃	−5.93	293.15
Pyr14	0.57 [14]	(C₂F₅)₃PF₃	−5.43	293.15
Py8-4Me	2 [14]	(C₂F₅SO₂)₂N	−5.4	298.15 [21]
Py8-4Me	2 [14]	(CF₃SO₂)₂N	−5.09	298.15 [21]
IM16	1.2 [14]	(CF₃SO₂)₃C	−5.04	293.15
Py8-4Me	2 [14]	AsF₆	−4.91	298.15 [21]
Pyr18	1.9 [14]	(CF₃SO₂)₂N	−4.71	298 [22]
IM18	1.9 [14]	(C₂F₅SO₂)₂N	−4.7	298 [23]
Py8-4Me	2 [14]	(C₄F₉)SO₃	−4.63	298.15 [21]
IM18	1.9 [14]	(CF₃SO₂)₂N	−4.6	298 [23]
IM18	1.9 [14]	(CF₃SO₂)₂N	−4.59	293.15
Py6-4NMe2	1.8 [19]	(CF₃SO₂)₂N	−4.53	293.15
Py6-4NMe2	1.8 [19]	(CF₃SO₂)₂N	−4.53	296.5 [24]
IM18	1.9 [14]	(CF₃SO₂)₂N	−4.5	288.15 [25]
IM18	1.9 [14]	(CF₃SO₂)₂N	−4.49	293.15 [25]
IM18	1.9 [14]	(CF₃SO₂)₂N	−4.47	298.15 [25]
IM14	0.67 [14]	(CF₃SO₂)₃C	−4.44	296.5 [24]
IM17	1.6 [14]	(CF₃SO₂)₂N	−4.31	288.15 [25]
IM17	1.6 [14]	(CF₃SO₂)₂N	−4.3	293.15 [25]
IM17	1.6 [14]	(CF₃SO₂)₂N	−4.29	298.15 [25]
IM18	1.9 [14]	(C₄F₉)SO₃	−4.23	298 [26]
IM16	1.2[14]	(CF₃SO₂)₂N	−4.18	293.15
IM16-2Me	1.4 [14]	(CF₃SO₂)₂N	−4.15	296.5 [24]
IM18	1.9 [14]	(CF₃SO₂)₂N	−4.14	296.5 [24]
Pyr16	1.2 [14]	(CF₃SO₂)₂N	−4.12	293.15
IM18	1.9 [14]	(CF₃SO₂)₂N	−4.1	298 [26]
IM18	1.9 [14]	(CF₃SO₂)₂N	−4.1	293.15 [27]
IM16	1.2 [14]	(CF₃SO₂)₂N	−4.05	288.15 [25]
IM16	1.2 [14]	(CF₃SO₂)₂N	−4.05	293.15 [25]
IM16	1.2 [14]	(CF₃SO₂)₂N	−4.03	296.5 [24]
IM16	1.2 [14]	(CF₃SO₂)₂N	−4.02	298.15 [25]
IM18	1.9 [14]	PF₆	−3.95	288.15 [28]
IM18	1.9 [14]	PF₆	−3.93	293.15
IM18	1.9 [14]	PF₆	−3.92	293.15 [28]
IM18	1.9 [14]	PF₆	−3.9	298.15 [28]
IM16	1.2 [14]	(CF₃SO₂)₂N	−3.86	293.15 [27]
Pip14	0.68 [19]	(CF₃SO₂)₂N	−3.78	298 [22]
IM15	0.92 [14]	(CF₃SO₂)₂N	−3.74	288.15 [25]
IM15	0.92 [14]	(CF₃SO₂)₂N	−3.73	293.15 [25]
IM15	0.92 [14]	(CF₃SO₂)₂N	−3.71	298.15 [25]
Py4-3Me	0.73 [14]	(CF₃SO₂)₂N	−3.7	296.5 [24]
Py4-4Me	0.73 [14]	(CF₃SO₂)₂N	−3.69	298 [26]
Py8-4Me	2 [14]	PhBF₃	−3.6	298.15 [21]
Pyr14	0.57 [14]	(CF₃SO₂)₂N	−3.59	298 [22]
Pyr14	0.57 [14]	(CF₃SO₂)₂N	−3.57	293.15
IM14	0.67 [14]	(CF₃SO₂)₂N	−3.54	288.15 [25]
IM14	0.67 [14]	(CF₃SO₂)₂N	−3.53	293.15 [25]
IM14	0.67 [14]	(CF₃SO₂)₂N	−3.51	298.15 [25]
IM14	0.67 [14]	(CF₃SO₂)₂N	−3.51	298 [26]
IM14	0.67 [14]	(CF₃SO₂)₂N	−3.5	296.5 [24]
IM14	0.67 [14]	(CF₃SO₂)₂N	−3.5	293.15
IM14	0.67 [14]	(CF₃SO₂)₂N	−3.49	294.15 [29]
IM14	0.67 [14]	(CF₃SO₂)₂N	−3.46	293.15 [27]
IM18	1.9 [14]	PF₆	−3.46	295 [30]
IM16	1.2 [14]	PF₆	−3.45	288.15 [28]
IM16	1.2 [14]	PF₆	−3.41	293.15 [28]
IM16	1.2 [14]	PF₆	−3.36	298.15 [28]
IM16	1.2 [14]	PF₆	−3.35	293.15
IM13	0.42 [14]	(CF₃SO₂)₂N	−3.29	288.15 [25]
IM13	0.42 [14]	(CF₃SO₂)₂N	−3.28	293.15 [25]
IM13	0.42 [14]	(CF₃SO₂)₂N	−3.27	298.15 [25]
Mor11O2	0.17	(CF₃SO₂)₂N	−3.19	293.15
IM14	0.67 [14]	(C₄F₉)SO₃	−3.15	298 [26]
IM12	0.22	(CF₃SO₂)₂N	−3.12	288.15 [25]
IM12	0.22	(CF₃SO₂)₂N	−3.1	296.5 [24]
IM12	0.22	(CF₃SO₂)₂N	−3.1	293.15 [25]
Py8-4Me	2 [14]	CF₃SO₃	−3.09	298.15 [21]
IM12	0.22	(CF₃SO₂)₂N	−3.08	293.15 [27]
IM12	0.22	(CF₃SO₂)₂N	−3.08	298.15 [25]
Py4-4Me	0.73 [14]	(C₄F₉)SO₃	−3.03	298 [26]
IM14	0.67 [14]	PF₆	−3	288.15 [28]
Py8-4Me	2 [14]	BF₄	−2.98	298.15 [21]
IM14	0.67 [14]	PF₆	−2.96	293.15 [28]
IM14	0.67 [14]	PF₆	−2.93	294 [31]
IM18	1.9 [14]	BF₄	−2.93	295 [30]
IM14	0.67 [14]	PF₆	−2.92	298.15 [28]
IM14	0.67 [14]	PF₆	−2.9	293.15
IM14	0.67 [14]	PF₆	−2.9	296.5 [24]
IM14	0.67 [14]	PF₆	−2.89	295 [30]
IM14	0.67 [14]	PF₆	−2.87	294.15 [29]
IM14	0.67 [14]	PF₆	−2.8	293.15 [27]
IM12	0.22	B(CN)₄	−2.46	296.5 [24]
Py3OH	−0.09	(CF₃SO₂)₂N	−2.43	293.15
IM12OH	−0.28 [19]	(CF₃SO₂)₂N	−2.34	296.5 [24]
N4444	2.3 [14]	(6-2Et)2SS	−1.52	298 [32]

^[a]

Cation acronyms explained in Table 1

^[b]

(6-2Et)-2SS = bis(2-ethylhexyl)sulfosuccinate