The 2,7-dibenzyldiazoniapyrene dication 22+ is unthreaded from the pseudorotaxane 12+ by addition of the aliphatic amine A. Protonation of the amine disrupts the interactions between A and 22+ and thus rethreading of 22+ by 1,5-dinaphtho-[38]crown-10 (3) can occur, making the whole process reversible. The changes in the relative positions of the components can be monitored by absorption and luminescence spectroscopy.
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Ballardini et al. (1996) studied this question.