Abstract
The unique properties of water in ionic liquid (IL)–water mixtures have attracted considerable attention; however, the association state of water in the IL nanospace requires continuous investigations. Here, we determined the proton exchange rate among water molecules from the half-band width of the proton nuclear magnetic resonance water peaks (H2O and HDO) in mixtures of two typical ILs, namely, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) and N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium tetrafluoroborate ([DEME][BF4]). At H2O:D2O = 1:1, the effects of water concentration and pH were systematically studied. Based on the data, we discussed very slow hydrogen–deuterium exchange in the IL mixtures with the association state of water molecules.
Published Version
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