Novel Anionic Host Lattices Built of Squarate and Thiourea Molecules

The new inclusion complexes [(C2H5)4N+]2C4O42−·4(NH2)2CS·2H2O (1), [(C2H5)4N+]2C4O42−·6(NH2)2CS (2) and [(C2H5)4N+]2C4O42−·2(NH2)2CS·2H2O (3) have been prepared and characterized by X-ray crystallography. In the crystal structure of (1), infinitely extended squarate–water chains inter-link adjacent puckered thiourea layers to generate a three dimensional host lattice with large uni-directional rectangular channels each containing a double column of well-ordered tetraethylammonium cations. In complex (2), well-ordered tetraethylammonium cations are stacked in single columns within the channel-type thiourea-squarate host lattice constructed by the cross-linkage of two types of layers. In complex (3), well-ordered teteraethylammonium cations are sandwiched between puckered layers generated by the cross-linkage between zigzag (C4O42−·2H2O)∞ chains and singly hydrogen-bonded dimeric thiourea ribbons.