Novel layer- and channel-type anionic host lattices built of thiourea, 2-thiouracil anion and water

Abstract

New inclusion complexes 3[(C₂H₅)₄N⁺C₄H₃N₂OS⁻]·(NH₂)₂CS·H₂O (1) and (n-C₃H₇)₄N⁺C₄H₃N₂OS⁻·(NH₂)₂CS·2H₂O (2) have been prepared and characterized by X-ray crystallography. In the crystal structure of 1, thiourea molecules, 2-thiouracil anions and water molecules generate a layer structure extending parallel to the (101) family of planes that involve typical O–H···O, N–H···O, O–H···S and N–H···S, N–H···N−hydrogen bonds, as well as weak C–H···O and C–H···S hydrogen bonds. The tetraethylammonium cations are arranged orderly between the stacked layers in a sandwich-like packing mode. Complex 2 features a three-dimensional host lattice containing intersecting open channels extending along the [001], [110] and [1$\text{1}$0] directions that are constructed through conventional hydrogen bonds. The tetra-n-propylammonium cations are accommodated in a zigzag fashion within each channel.