Dipotassium zinc tetraiodate(V) dihydrate

The title compound, K2Zn(IO3)4·2H2O, contains two symmetry-independent K and I atoms. These atoms, as well as the Zn atom, are coordinated by shared O atoms and, moreover, the Zn atom is coordinated by two water molecules in trans positions. The K, Zn and water O atoms atoms are situated in special positions on twofold symmetry axes. The hydrogen atoms are involved in strong O—H⋯O hydrogen bonds and O—H⋯I interactions also occur. The crystals of the title compound are, in general, twinned, but the sample used for this experiment was free of twinning.