Nicholas P. Clague, Jonathan D. Crane, Ekkehard Sinn, Nigel A. Young, William Clegg, William Clegg, Simon J. Coles, Simon J. Teat and David J. Moreton
The structure of the dipotassium complex of the dianion of p-tert-butylcalix[8]arene crystallised from a protogenic, coordinating solvent (ethanol–diethylcarbonate, 10:1) shows that the metal ions are bound above and below the cavity of the calix[8]arene, which adopts a ‘pinched’ conformation.