Abstract
The sodium uranyl sulfate hydrate, Na6(UO2)(SO4)4(H2O)2, has been synthesized and the crystal structure has been determined by single-crystal X-ray diffraction. The structure crystallizes in space group P1, a=5.5503(5), b=11.2456(9), and c=14.256(1) Å, α=91.483(2), β=92.583(2), and γ=97.588(2)°, V=880.6(2) Å3, Z=2, and has been refined on the basis of F2 for all unique data collected with monochromatic MoKα X-radiation and a CCD-based detector to an agreement factor (R1) of 3.38%, calculated using 5617 unique observed reflections (∣Fo∣≥4σF). The structure contains a novel uranyl sulfate cluster with composition [(UO2)(SO4)4]6− that is composed of a uranyl pentagonal bipyramid and four sulfate tetrahedra. Three sulfate tetrahedra are linked to the uranyl pentagonal bipyramid by the sharing of vertices, and the other shares an equatorial edge of the uranyl pentagonal bipyramid. This is the second structure known to involve the sharing of an edge of a uranyl polyhedron with a tetrahedron containing a hexavalent cation. The uranyl sulfate clusters are linked through bonds to Na cations, and by H bonding.
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