Aqua(4,4 #8242;-bipyridine- #954;N)bis(1,4-dioxo-1,4-dihydronaphthalen-2-olato- #954;2O1,O2)zinc 4,4 #8242;-bipyridine monosolvate dihydrate

The reaction of 2-hydroxy-1,4-naphthoquinone and 4,4′-bipyridine with zinc acetate produced the title compound, [Zn(C10H5O3)2(C10H8N2)(H2O)]·C10H8N2·2H2O. The bond lengths and angles around the metal atom indicate a deviation from octahedral geometry. The two naphthoquinone ligands coordinate in a cis fashion, with the 4,4′-bipyridine ligand and the water molecules completing the coordination sphere of the metal atom. The asymmetric unit contains also one free 4,4′-bipyridine molecule and two uncoordinated water molecules. These molecules make contacts with the complex through O—H...N and O—H...O hydrogen bonds, creating a layer two-dimensional network parallel to (121).