F. Arnaudneu et al., A SUPRAMOLECULAR ASSEMBLY OF A MULTIFUNCTIONAL CALIX[4]ARENE WITH ALKALI AND ALKALINE-EARTH CATIONS IN SOLUTION AND IN THE SOLID-STATE, Supramolecular chemistry, 7(3), 1996, pp. 215-222
p-tert-Butylcalix[4]arene derivatives 2 and 4 bearing one carboxylic a
cid, one ester and two phenolic groups on the lower rim form pH-depend
ent mononuclear or binuclear assemblies with alkali (excluding lithium
) and alkaline earth cations. The structures of binuclear K+ complexes
5 and 6 of 2 and 4, respectively, have been determined by X-ray diffr
action.