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A tightly packed cavity that contains a guest molecule, 2,6-adamantanedione, is formed by a capsular hydrogen-bonded assembly (see figure). The crystal structure reveals an intricate network of hydrogen bonds, which specifically orients the ketone guest in the capsule cavity. The solid-state data complement the behavior of the assembly in the solution phase and provide a rationale for the guest-binding selectivity of the capsule.
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Johnson et al. (2002) studied this question.
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