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The crystal stucture of hexapotassium undecahydrogen tetratungsto hexaantimonate(Ⅴ) tetrahydrate has been determined from single crystal X-ray diffraction data. Crystal data are as follows: K6H12[Sb6W4O36]·4H2O, Fw = 2360.62, tetragonal, I41/a, a = 10.799(1) Å, c = 35.244(5) Å, V = 4110.1(7) Å3, Z = 4, Dx = 3.82 gcm-3, μ(MoKα) = 160.15 cm-1, T = 293 K, final R = 0.0356 for 2400(Fo > 3σ(Fo)) independent reflections. The [H12Sb6W4O36]-6 polyanion independently consists of one tungsten, two antimony, and nine oxygen atoms and belongs to the 4(S4) point group. This polyanion is formed by two open octahedra five membered ring of Sb(3)O6-W(1)O6-Sb(2)O6-W(1)O6-Sb(3)O6 which is connected at right angle. The Sb-W, Sb-O, and W-O bond distances range from 3.2304(9) to 3.2403(5) Å, 1.745(8) to 2.334(6) Å, and 1.914(7) to 2.039(7) Å, respectively.
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