STRUCTURES OF THE MULTIRECEPTOR VAULTED CYCLIDENE COMPLEXES

The preparations and structures of three vaulted cyclidene complexes a re compared with the two previously reported. All show similar structu res with large rigid cavities partly closed off by the piperidine rise rs, illustrating in particular the attractive effect of van der Waals forces resulting in the incorporation of solvent molecules or [PF6](-) ions nesting on the edges of the cavities. However, the detailed geom etries vary, according to the nature of the ligand substituents, the m etal, the counter-ion and the lattice solvent molecules. These give ri se to differing orientations of the capping aromatic rings and the pip eridine risers.