Supramolecular organization via varied combination modes in triaqua(muÝ-8-hydroxy-7-iodoquinoline-5-sulfonato)barium (II) monohydrate

In the crystal structure of [Ba(C9H4INO4S)(H2O)3]·H2O, the asymmetric unit contains a Ba2+ ion, an 8-hydroxy-7-iodoquinoline-5-sulfonate anion, three coordinated water molecules and an uncoordinated water molecule. The Ba2+ ion has a nine-coordinate monocapped antiprismatic geometry, formed by four O atoms of three different sulfonate groups, the chelating N and O atoms of the oxine ring, and three water molecules. Each sulfonate group bridges three neighbouring Ba2+ ions. The organic ligands are stacked over one another, each pair of adjacent members of the stack being related by inversion symmetry. These stacks are crosslinked by Ba2+ ions, leading to a three-dimensional network, which is further stabilized by O-HO hydrogen bonds.