A. Ikeda et al., IONOPHORIC PROPERTIES OF A DOUBLY-BRIDGED CALIX[8]ARENE BEARING A 8-OXYGENS CONVERGING CAVITY, Chemistry Letters, (11), 1996, pp. 963-964
A novel globular molecule was synthesized by doubly-bridging calix[8]a
rene at 1,5- and 3,7-phenol units. The structure is very unique becaus
e of its high molecular symmetry and eight oxygens convergently integr
ated in a cavity. Extraction and H-1 NMR spectroscopic studies establi
shed that this cavity shows the high Cs+ affinity as well as the high
Cs+ / Na+ selectivity.