Room temperature synthesis and solid-state structure of Ni2P2O6·12H2O

The synthesis and crystal structure of Ni2P2O6·12H2O are reported. The compound was synthesized from aqueous solutions of nickel chloride and sodium hypodiphosphate at room temperature. The space group is orthorhombic, Pnnm. Unit cell dimensions are image, image, and image, image. The product is unstable with respect to dehydration above room temperature.