(NH₄)₄Na₂[Mo₂V^IV₂V^V₆O₂₈].10H₂O

The title compound, tetraammonium disodium octacosaoxo(dimolybdenumoctavanadium)ate decahydrate, is a mixed V/Mo salt which has a well known decavanadate structure. The centrosymmetric polyanion consists of eight (V/Mo)O₆ and two VO₆ edge-sharing distorted octahedra. Each of the two Na⁺ cations is surrounded by six water molecules in a distorted octahedron. The V-O and (V/Mo)-O distances are between 1.571 (6) and 2.432 (5) Å.

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