The self-assembly of a π-electron deficient bipyridinium-based cyclophane around a π-electron rich ferrocene-based polyether as template provides a relatively simple method of self-assembling, in preparative yields, an organic molecular square—namely, cyclobis(paraquat-4,4′-biphenylene)—that is able to recognise and bind π-electron rich guests.
P. R. Ashton, S. Menzer, F. M. Raymo, G. K. H. Shimizu, J. F. Stoddart and D. J. Williams, Chem. Commun., 1996, 487 DOI: 10.1039/CC9960000487
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