The chosen one: A molecular cage has been shown to form pseudorotaxane-like complexes with threaded anthraquinone and squaraine units in the presence of templating Na+ ions (see picture). The complexation and decomplexation of the pseudorotaxane complexes in solution occur with significant color changes which allows this ion-specific templating effect to be easily monitored with the naked eye.
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Hsueh et al. (2007) studied this question.
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