Abstract

Proton speciation in ambient-temperature chloroaluminate ionic liquids, composed of 1-ethyl-3-methylimidazolium chloride (ImCl) and aluminum chloride has been examined by 2 H NMR and FT-IR spectroscopies. In oxide free basic melts (excess ImCl), two proton-containing species, HCl and HCl 2 - , exist which are in an equilibrium that strongly favors the formation of the dichloride ion. In oxide free acidic melts (excess AlCl 3 ) HCl is the only proton-containing species.

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