Helical polyrotaxane: cucurbituril ‘beads’ threaded onto a helical one-dimensional coordination polymer

Abstract

Formation of a pseudorotaxane by threading a cucurbituril ‘bead’ with a N,N′-bis(3-pyridylmethyl)-1,4-diaminopentane ‘string’ followed by reaction of the pseudorotaxane with AgNO₃ yields a polyrotaxane, the X-ray crystal structure of which reveals the ‘beads’ threaded onto a helical one-dimensional coordination polymer.

References

1. Recent review articles: (a) J. P. Sauvage, Acc. Chem. Res., 1990, 23, 319; (b) D. B. Amabilino and J. F. Stoddart, Chem. Rev., 1995, 95, 2725; (c) D. Philp and J. F. Stoddart, Angew. Chem., Int. Ed. Engl., 1996, 35, 1154; (d) H. Gibson, M. C. Bheda and P. T. Engen, Prog. Polym. Sci., 1994, 19, 843.
2. (a) D. Whang, Y.-M. Jeon, J. Heo and K. Kim, J. Am. Chem. Soc., 1996, 118, 11333; (b) D. Whang and K. Kim, J. Am. Chem. Soc., 1997, 119, 451.
3. Reviews on cucurbituril: W. L. Mock, Top. Curr. Chem., 1995, 175, 1; P. Cintas, J. Incl. Phenom. Mol. Recognit. Chem., 1994, 17, 205.