Hydrogen-Bonded Anionic Host Lattices Constructed with Isocyanurate and Thiourea/Urea

A series of seven inclusion complexes containing the isocyanurate ion, thiourea/urea, and selected quaternary ammonium ions as templates, namely, (CH₃)₄N⁺C₃H₂N₃O₃^-· 3(NH₂)₂CS·H₂O (1), (CH₃)₄N⁺C₃H₂N₃O₃^-·(NH₂)₂CS (2), (C₂H₅)₄N⁺C₃H₂N₃O₃^-·(NH₂)₂CS (3), (n-C₃H₇)₄N⁺C₃H₂N₃O₃^-·(NH₂)₂CS·H₂O (4), 3[(n-C₄H₉)₄N⁺C₃H₂N₃O₃^-]·5(NH₂)₂CS·3H₂O (5), (C₂H₅)₄N⁺C₃H₂N₃O₃^-·(NH₂)₂CO (6) and (n-C₃H₇)₄N⁺C₃H₂N₃O₃^-·2(NH₂)₂CO·H₂O (7), have been prepared and characterized by X-ray crystallography. Complex (1) features a hydrogen-bonded molecular cage in which two (CH₃)₄N⁺ cations can be accommodated. Complexes (2) and (7) are channel-type inclusion compounds. In (2), the thiourea sulfur atom does not participate in host lattice construction, while (7) contains several intersecting channel systems that are formed by the cross-linkage of two sets of isocyanurate-urea-water ribbons. Complexes (3)-(6) exhibit layer-type architectures. The host layers of complexes (3) and (6) are constructed by two distinct rosette motifs produced by isocyanurate ion and thiourea/urea in a ratio of 2:1 and 1:2, respectively. The isocyanurate-thiourea-water (1:1:1) ribbons are cross-linked together to generate the host framework of complex (4), while a new type of supramolecular rosette ribbon is identified in complex (5).