Dipotassium zinc tetraiodate(V) dihydrate

Abstract

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.