Abstract
Two uranyl tellurates, AgUO 2(HTeO 5) ( 1) and Pb 2UO 2(TeO 6) ( 2), were synthesized under hydrothermal conditions and were structurally, chemically, and spectroscopically characterized. 1 crystallizes in space group Pbca, a=7.085(2) Å, b=11.986(3) Å, c=13.913(4) Å, V=1181.5(5) Å 3, Z=8; 2 is in P2(1)/ c, a=5.742(1) Å, b=7.789(2) Å, c=7.928(2) Å, V=90.703(2) Å 3, and Z=2. These are the first structures reported for uranyl compounds containing tellurate. The U 6+ cations are present as (UO 2) 2+ uranyl ions that are coordinated by O atoms to give pentagonal and square bipyramids in compounds 1 and 2, respectively. The structural unit in 1 is a sheet consisting of chains of edge-sharing uranyl pentagonal bipyramids that are one bipyramid wide, linked through the dimers of TeO 6 octahedra. In 2, uranyl square bipyramids share each of their equatorial vertices with different TeO 6 octahedra, giving a sheet with the autunite-type topology. Sheets in 1 and 2 are connected through the low-valence cations that are located in the interlayer region. The structures of 1 and 2 are compared to those of uranyl compounds containing octahedrally coordinated cations.
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