Abstract
In this study, the proton behaviors of protic ionic liquid (pIL) and pseudo-protic ionic liquid (psIL)–water solutions were investigated using pH measurements. Propylammonium nitrate (PAN) as a representative pIL was characterized based on the water concentration dependence of the pH values. Above 60 mol% H2O, pH increased by increasing the water concentration. Furthermore, 1-ethylimidazolium nitrate [C2Him][NO3] as a psIL was a weakly acidic. The pH values of [C2Him][NO3]–H2O were not affected by the water content. Two different pIL and psIL provided different proton behaviors in the water-mediated circumstance.
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