Abstract
We have investigated the H/D exchange reaction between heavy water and an ionic liquid, 1-butyl-3-methyl-imidazolium tetrafluoroborate ([bmim][BF4]), throughout the whole concentration region as a function of D2O mol% at room temperature. We expected that the extent of the H/D reaction would increase linearly with increasing content of D2O, but the results show an extended N-shaped behavior having a small maximum at around 40 mol% and the reaction becomes very slow at a specific concentration around 80 mol%. We found that this non-linear concentration dependence correlates with the pD dependence of the solutions.
Highlights
Room temperature Ionic liquids (RTILs) shows versatility of their properties by interchanging cations and anions [1,2]
We expected that the extent of the H/D reaction would increase linearly with increasing content of D2O, but the results show an extended N-shaped behavior having a small maximum at around 40 mol% and the reaction becomes very slow at a specific concentration around 80 mol%
The results show an extended N-shaped behavior having a small maximum at around 40 mol% and the reaction does hardly occurs at a specific concentration region of ~80 mol%
Summary
Room temperature Ionic liquids (RTILs) shows versatility of their properties by interchanging cations and anions [1,2]. Even at water-rich conditions, H2O ice crystals and the solitary water co-exist in the solutions These facts imply that the nearly-free hydrogen bonded state of water molecule is fairly stable once formed in the RTIL. By applying this useful method to the RTIL-D2O mixture, the H/D exchange reaction rate in hydrophilic 1-butyl-3-methylimidazolium chloride ([bmim][Cl]) at 50 ̊C has been studied in detail by Nakahara et al [13]. They found a slowdown of H/D exchange reaction rate in the water-poor conditions at D2O below 7 M (~30 mol% D2O), reflecting that solitary water as a single molecule without self-associated state is deactivated in the region where the solitary water is bound strongly by the solvent ions (Cl–) as the waterwater contact is negligible compared to water in waterrich conditions. We show a peculiar concentration dependence of the H/D exchange reaction in the mixed solution
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