all-Z-tetrabenzo[16]- and pentabenzo[20]annulenes, pi-cavitands binding tosilver cation

Crystal structures of the silver complexes derived from tetrabenzo[16]annul ene with AgOTf and AgClO4 are different, although these two complexes show similar H-1 NMR spectra reflecting a similar clathrate structure in solutio n. The silver complex of pentabenzo[20]annulene with AgClO4 adopts a clathr ate structure both in the solid state and in solution.