Confinement of Water-Soluble Cationic Substrates in a Cationic Molecular Cage by Capping the Portals with Tripodal Anions

The
ability of a cationic coordination cage to encapsulate molecular
guests is enhanced by non-covalent capping of the cage portals with
tripodal anions. The capped cage provides new cation binding sites
at the portals, which enable accommodation of cationic substrates
within the cationic cage. In addition, non-covalent capping allows
neutral guests in the cage to be exchanged for cationic ones on demand.