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- W1544337977 abstract "The reactions of UO3 and TeO3 with KCl, RbCl, or CsCl at 800 °C for 5 d yield single crystals of A2[(UO2)3(TeO3)2O2] (A=K (1), Rb (2), and Cs (3)). These compounds are isostructural with one another, and their structures consist of two-dimensional ∞2[(UO2)3(TeO3)2O2]2- sheets arranged in a stair-like topology separated by alkali metal cations. These sheets are comprised of zigzagging uranium(VI) oxide chains bridged by corner-sharing trigonal pyramidal TeO32− anions. The chains are composed of dimeric, edge-sharing, pentagonal bipyramidal UO7 moieties joined by edge-sharing tetragonal bipyramidal UO6 units. The lone-pair of electrons from the TeO3 groups are oriented in opposite directions with respect to one another on each side of the sheets rendering each individual sheet non-polar. The alkali metal cations form contacts with nearby tellurite oxygen atoms as well as with oxygen atoms from the uranyl moieties. Crystallographic data (193 K, MoKα, λ=0.7107Å): 1, triclinic, space group P1¯, a=6.7985(5)Å, b=7.0123(5)Å, c=7.8965(6)Å, α=101.852(1)°, β=102.974(1)°, γ=100.081(1)°, V=349.25(4)Å3, Z=2, R(F)=2.70% for 98 parameters and 1697 reflections with I>2σ(I); 2, triclinic, space group P1¯, a=7.0101(6)Å, b=7.0742(6)Å, c=8.0848(7)Å, α=105.590(2)°, β=101.760(2)°, γ=99.456(2)°, V=367.91(5)Å3, Z=2, R(F)=2.36% for 98 parameters and 1817 reflections with I>2σ(I); 3, triclinic, space group P1¯, a=7.0007(5)Å, b=7.5195(6)Å, c=8.4327(6)Å, α=109.301(1)°, β=100.573(1)°, γ=99.504(1)°, V=399.49(5)Å3, Z=2, R(F)=2.61% for 98 parameters and 1965 reflections with I>2σ(I)." @default.
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- W1544337977 date "2004-11-01" @default.
- W1544337977 modified "2023-10-16" @default.
- W1544337977 title "Synthesis and crystal structures of the layered uranyl tellurites A2[(UO2)3(TeO3)2O2] (A=K, Rb, Cs)" @default.
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- W1544337977 doi "https://doi.org/10.1016/j.jssc.2004.06.054" @default.
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