Novel anionic host lattices built of squarate and thiourea molecules

The new inclusion complexes [(C2H5)(4)N+](2)C4O42-. 4(NH2)(2)CS . 2H(2)O (1), [(C2H5)(4)N+](2)C4O42-. 6(NH2)(2)CS (2) and [(C2H5)(4)N+](2) C4O42-. 2(NH2)(2)CS . 2H(2)O (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 unidirectional 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 crosslinkage 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-. 2H(2)O)(infinity) chains and singly hydrogen-bonded dimeric thiourea ribbons. (C) 2000 Elsevier Science Ltd. All rights reserved.