A Cucurbituril-Based Gyroscane: A New Supramolecular Form This research was supported by the Australian Research Council and the University of New South Wales. G.R.L. acknowledges the award of a Royal Society Fellowship tenable in Australia.

Abstract

Concentric rotating and precessing macrocycles: The crystal structure of the inclusion complex of cucurbit[5]uril within cucurbit[10]uril shows the macrocycles to be concentric but not coaxial, and with a chloride ion at the center (see structure). Both rings rotate freely relative to each other in solution, as shown by NMR spectroscopy. The facile axial and precessive motion of the inner ring relative to the outer ring represents the molecular analogy of the gyroscope. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2002/z17899_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.