Pr. Ashton et al., THE SELF-ASSEMBLY AND METAL-MEDIATED DISASSEMBLY OF A MULTI-TOPIC [2]PSEUDOROTAXANE, Chemical communications, (4), 1996, pp. 479-481
A [2]pseudorotaxane, consisting of the cyclobis(paraquat-p-phenylene)
tetracation complexing a polyether chain intercepted in its middle by
a hydroquinone ring and terminated at each end by 12-crown-4 macrocycl
es, undergoes disassembly readily in acetonitrile solution on addition
of alkali metal salts.