A new type of tunnel structure is described in which guest molecules are disordered along, but tend to order in directions perpendicular to, the tunnel axis; one of the nine Na+ ions in the asymmetric unit displays 8-fold co-ordination of a kind hitherto reported for this ion only in macrocyclic antibiotics.
J. M. Adams, R. G. Pritchard and J. M. Thomas, J. Chem. Soc., Chem. Commun., 1978, 288 DOI: 10.1039/C39780000288
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