Prediction of Refractive Indices of Binary Mixtures of Ionic Liquids and Water

Table 1

Details of the properties, viz., molar mass (Mw/g·mol⁻¹), density (ρ/g·cm⁻³), molar volume (Vm/cm³·mol⁻¹), refractive index (n_D), and molar refraction (Rm/cm³·mol⁻¹) of pure ionic liquids (ILs) belong to the binary IL + H₂O mixtures (Mn) used in this work to predict the refractive indices at 298.15 K [24–34].

M. no	Ionic liquid	Mw (g·mol^−1)	ρ (g·cm^−3)	Vm (cm^3·mol^−1)	nD	Rm (cm^3·mol^−1)	Reference
	Water	18.015	0.9971	18.07	1.3324	3.71	Average
M1	1-Ethyl-3-methylimidazolium ethylsulfate	236.29	1.2376	190.9	1.47940	54.18	Gómez et al. [24]
M2	Pyrrolidinium nitrate	134.13	1.1675	114.9	1.3955	27.57	Anouti et al. [25]
M3	Pyrrolidinium octanoate	215.33	0.9452	227.8	1.4581	62.17	Anouti et al. [26]
M4	1-Allyl-3-methyl-imidazolium chloride	158.63	na	na	na	na	Wu et al. [27]
M5	1-(2-Hydroxyethyl)-3-methylimidazolium tetrafluoroborate	213.97	1.3633	157.0	1.4252	40.15	Rives et al. [28]
M6	1-Ethyl-3-methylimidazolium trifluoromethanesulfonate	260.23	1.38358	188.1	1.4332	48.90	Vercher et al. [29]
M7	1-Butyl-1-ethylimidazolium trifluoromethanesulfonate	302.32	1.26313	239.3	1.43944	63.01	Vercher et al. [29]
M8	1-Butyl-3-methylimidazolium trifluoromethanesulfonat	288.29	1.29743	222.2	1.43729	58.25	Vercher et al. [29]
M9	1-Butyl-1-methylpyrrolidinium trifluoromethanesulfonate	291.33	1.25201	232.7	1.43267	60.44	Vercher et al. [29]
M10	1-Butyl-3-methylimidazolium dicyanamide	205.26	1.06017	193.6	1.50893	57.80	Gonzalez et al. [30]
M11	1-Butyl-3-methylimidazolium trifuoromethanesulfonate	288.29	1.29955	221.8	1.43755	58.18	Gonzalez et al. [30]
M12	1-Butyl-1-methylpyrrolidinium dicyanamide	208.30	1.01353	205.5	1.49681	60.12	Gonzalez et al. [30]
M13	1-Butyl-1-methylpyrrolidinium trifluoromethanesulfonate	291.33	1.25298	232.5	1.43289	60.42	Gonzalez et al. [30]
M14	1-Butyl-3-methylpyridinium trifluoromethanesulfonate	237.05	1.27941	185.3	1.46155	50.89	Gonzalez et al. [30]
M15	1,2- Diethylpyridinium ethylsulfate	261.34	1.21926	214.3	1.51350	64.48	Gonzalez et al. [30]
M16	1-Hexyl-3-methylimidazolium dicyanamide	233.31	1.02856	226.8	1.50415	67.18	Gonzalez et al. [30]
M17	1-Methylpyridinium methylsulfate	205.23	1.34612	152.5	1.51340	45.85	Gonzalez et al. [30]
M18	Ethylammonium acetate	105.14	1.01771	103.3	1.4345	26.93	Hou et al. [31]
M19	Propylammonium acetate	119.16	0.96682	123.2	1.4405	32.51	Hou et al. [31]
M20	Diethylammonium acetate	133.11	1.02141	130.3	1.431	33.73	Umapathi et al. [32]
M21	Diethylammonium hydrogen sulfate	171.06	1.28395	133.2	1.422	33.86	Umapathi et al. [32]
M22	Triethylammonium acetate	161.14	1.05186	153.2	1.501	45.13	Umapathi et al. [32]
M23	Triethylammonium hydrogen sulfate (TEAS)	199.09	1.14289	174.2	1.516	52.62	Umapathi et al. [32]
M24	Trimethylammonium acetate (TMAA)	119.05	1.05385	113.0	1.392	26.90	Umapathi et al. [32]
M25	Trimethylammonium hydrogen sulfate (TMAS)	157.03	1.46758	107.0	1.406	26.28	Umapathi et al. [32]
M26	2-Hydroxy ethylammonium butanoate	149.18	1.07259	139.1	1.4661	38.53	Rocha Pinto et al. [33]
M27	2-Hydroxy ethylammonium pentanoate	163.21	1.04354	156.4	1.4645	43.20	Rocha Pinto et al. [33]
M28	2-Hydroxy ethylammonium hexanoate	177.24	1.01995	173.8	1.4623	47.80	Rocha Pinto et al. [33]
M29	2-Hydroxy diethylammonium hexanoate	221.30	1.05871	209.0	1.4714	58.47	Rocha Pinto et al. [33]
M30	1,1,3,3-Tetramethylguanidine imidazolide	183.26	0.9928	184.6	1.4943	53.77	Ye et al. [34]

The density and refractive index values were taken from all the sources and averaged.