科研之友
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摘要
In order to study micro-structural heterogeneities in the solutions of ionic liquids (ILs), ethanolammonium acetate (EOAA) IL has been synthesized and H-1 NMR spectra of its binary solutions, namely EOAA/DMSO and EOAA/n-butanol, have been measured at 298.15K. Then the concentration-dependent chemical shifts (?CH3, EOAA), (?CH3, DMSO) and (?CH3, n-butanol) have been correlated separately using the local composition (LC) model. The results indicated that self-association of EOAA played the leading role within EOAA-rich region in mixtures. However with the molecular solvents increasing, the interactions between EOAA and solvents gradually predominated. Moreover the comparisons between DMSO and n-butanol have demonstrated that DMSO could break the network of IL more easily, indicating that the influence of DMSO on the properties of EOAA should be more obvious, which was consistent with experimental results of viscosity and conductivity. Furthermore the maximum difference between the local and the bulk appeared at x(EOAA)approximate to 0.5 for both systems, which reflected remarkable nonideality of mixtures at this concentration.
