Abstract
Abstract (NH4)4H4As4Mo12O50·4H2O is tetragonal: space group P42/nnm, Z = 2, a = 11.923 (3), c = 17.564 (2) Å. The crystal contains a discrete polyanion, H4As4Mo12O504− of a Td point symmetry, consisting of four trigonal Mo3O13 groups. They are bound each other at six oxygen atoms, four AsO4 tetrahedra are attached from outside of the Mo12O46 cage. There is an empty cavity of the radius of 1.43 Å at the center of the polyanion.
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