Be my guest: Two molecules of a cavitand tetraboronic acid and four molecules of a bis(catechol) linker quantitatively assemble into a capsule (see picture for two views), with highly selective guest-recognition, by dynamic boronic ester formation. The on/off control of capsule formation with guest encapsulation is achieved by removal/addition of methanol.
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Nishimura et al. (2008) studied this question.
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