A crystal of 1-butyl-3-methylimidazolium iodide [bmim]I, a prototype ionic liquid, has been prepared and its crystal structure has been determined at the space group P212121. The butyl-chain has gauche and trans configurations, and only one H atom of cation is linked to the iodide anion through a hydrogen bond. The weak hydrogen-bonded network involving the iodide anion is a characteristic feature of [bmim]I, which could be related to the observation that crystallization was accomplished under 233 K.
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Nakakoshi et al. (2006) studied this question.
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