Fig. 2

Crystal structure of host PCP. Views of the nanochannel structure of 1S⊃H2O along the c-axis (a) and a-axis (b). Atoms: Cu (purple), O (red), C (grey). Styryl groups are periodically aligned along the c-axis at a distance of 6.8 Å on each face of the hexagonal channel. H atoms and one of the disordered vinyl moieties have been omitted for clarity