Ammonium Zinc Vanadium Phosphate, (NH₄)₃Zn₂V(PO₄)₂(HPO₄)₂

The title compound, triammonium dizinc vanadium bis(phosphate) bis(hydrogen phosphate), (NH₄)₃[Zn₂V(PO₄)₂(HPO₄)₂], is the first ammonium zinc vanadium phosphate. It is built up from a three-dimensional network of vertex-sharing VO₆ octahedra, and ZnO₄, PO₄, and HPO₄ tetahedra, fused together via V—O—P and Zn—O—P bonds [d_av(V—O) = 2.001 (2), d_av(Zn—O) = 1.949 (2) and d_av(P—O) = 1.538 (2) Å; θ_av(V—O—P) = 142.5 and θ_av(Zn—O—P) = 131.6°]. NH₄⁺ cations occupy two different types of interstices in the Zn—V—P—O framework.

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