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Ammoniumparatungstate tetrahydrate (NH 4 ) 10 [H 2 W 12 O 42 ] · 4H 2 O crystallizes in space group  P 2 1 / n ,  a  = 15.08,  b  = 14.45,  c  = 11.00 Å,  β  = 109.40°,  Z  = 2. The W atoms were located by a Patterson map, the lighter atoms (21 O, 5NH 4  + , 2H 2 O per asymmetric unit) by a  ΔF  map. Using anisotropic temperature factors for W and isotropic ones for the other atoms, the structure was refined to  R  = 6.7% for 3235 observed reflections (including 707 unobserved reflections:  R  = 6.8%). The O atoms of the anion [H 2 W 12 O 42 ] 10−  are hexagonal closed packed, containing the W atoms in octahedral sites. The anion shows 2/ m  pseudosymmetry. It consists of four groups of three edge-sharing WO 6  octahedra each. The non-acid protons are located in the inside of the anion near its center. The NH 4  + ions occupy similar sites at the surface of the anion as they were found for ammoniumparatungstate decahydrate.

Die Kristallstruktur des Ammoniumparawolframat-tetrahydrats (NH 4 ) 10 [H 2 W 12 O 42 ]·4H 2 O*