A method to isolate CB[7] from a CB[5]/CB[7] mixture has been successfully developed by incorporating an alkyl-imidazolium ionic liquid guest of the type [C(n)mim]Br which is only capable of binding with CB[7]. This CB[7]-[C(n)mim]Br complex can be removed from the mixture and a subsequent solid state ion metathesis affords pure CB[7]. Moreover, the imidazolium ionic liquids can be recycled from the aqueous solution after the purification thus providing a 'green' process.
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Jiao et al. (2010) studied this question.