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Refractive indices, isotropic polarizabilities, derived molar refractions, Rm, and free volumes, fm, at 298.15 K and atmospheric pressure.
| IL | n D | Polarizability (bohr3) | Rm (cm3·mol−1) | fm (cm3·mol−1) |
|---|---|---|---|---|
| [N4111][NTf2] | 1.40818 | 187.70 | 70.16 | 214.14 |
| [N4441][NTf2] | 1.42643 | 261.06 | 97.59 | 282.94 |
| [S221][NTf2] | 1.42325 | 174.84 | 65.36 | 191.16 |
| [S222][NTf2] | 1.42632 | 187.36 | 70.04 | 203.13 |
