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Macroscopic and Microscopic Study of 1-Ethyl-3-methyl-imidazolium Acetate–DMSO Mixtures

Abstract : Macroscopic (steady-state viscosity, density) and microscopic (NMR chemical shifts, 1H NMR relaxation times, and diffusion) properties of the 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]) -dimethyl sulfoxide (DMSO) mixture were studied in detail as a function of DMSO molar fraction at various temperatures. Temperature dependencies were used to calculate the activation energies. NMR results indicate that at low molar fraction of DMSO (<0.4), it weakly associates with the cation and in doing so disrupts the strong ion-ion association that exists in the pure ionic liquid. Stokes -Einstein equation, which linearly correlates the diffusion coefficient of a spherical molecule and macroscopic viscosity, was shown to work well for the [EMIM][OAc] -DMSO mixture. The influence of DMSO on the "anomalous" diffusion in [EMIM][OAc] ("quick" cation vs "slow " anion) was investigated; it was demonstrated that DMSO makes the cation diffusion slower. All parameters studied showed relatively small deviations from the ideal mixing rule behavior (from 20% to 50% difference between experimental and theoretically predicted results), confirming weak interactions between the components. (Graph Presented).
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Submitted on : Wednesday, February 11, 2015 - 11:16:32 AM
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Asanah Radhi, Kim Anh Le, Michael E. Ries, Tatiana Budtova. Macroscopic and Microscopic Study of 1-Ethyl-3-methyl-imidazolium Acetate–DMSO Mixtures. Journal of Physical Chemistry B, American Chemical Society, 2015, 119 (4), pp.1633-1640. ⟨10.1021/jp5112108⟩. ⟨hal-01115473⟩



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