Supramolecular assemblies of host–guest complexes of cucurbit[6]uril with some organic molecules

Four host–guest complexes, {(gI)@(CyH)6Q[6]}·3H2O (1), {(gIIH2)2+@(CyH)2Q[6]}·2Cl−·21H2O (2), {(gIII)@Q[6]}·27H2O (3), and {(gIVH)+@(CyH)2Q[6]}·Cl−·13H2O (4), have been prepared from cyclohexanocucurbit[6]uril, {(CyH)6Q[6]}, symmetrical dicyclohexanocucurbit[6]uril {(CyH)2Q[6]}, and cucurbit[6]uril {Q[6]} as hosts, and four different guests, namely 2-phenyl-2H-imidazole (gI), the HCl salt of N1,N4-bis(pyridin-3-ylmethyl)butane-1,4-diamine (gII), benzylamine (gIII), and the HCl salt of 4-(1H-imidazolyl)phenol (gIV). Their crystal structures have been characterized by single-crystal X-ray diffraction analyses and revealed that these hosts can form supramolecular assemblies through iondipole interactions, hydrogen bonding, CH···π or NH···π interactions, and π···π stacking.