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inorganic compounds
(NH4)2Na3(V3W3O19).12H2O, diammonium trisodium nonadecaoxo(tritungsto)trivanadate dodecahydrate, is a mixed V/W salt in which each site has an approximately equal population of V and W atoms. The centrosymmetric polyanion consists of six (V/W)O6 edge-sharing distorted octahedra and has a well established structure. Each of the three Na+ cations is surrounded by six water molecules in a distorted octahedron. The (V/W)-O distances are between 1.644 (14) and 2.2885 (10) Å.