The salts [emim]X ( X = Br or I, emim = 1 -ethyl-3-methylimidazolium) and [emim] [AIBr,] have been prepared as solid-state models of the [emim]X-AIX, ( X = CI or Br) ionic liquid systems. All three have been characterised crystallographically. The salts [emim]X ( X = Br or I) are isomorphous and are composed of ions in an extended hydrogen-bonded network. The implications of these results for both the structure and solvent properties of the ionic liquids are discussed.

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