Abstract
Single crystals of the potassium uranyl iodate, K[UO 2(IO 3) 3] ( 1), have been grown under mild hydrothermal conditions. The structure of 1 contains two-dimensional ∞ 2 [ UO 2 ( IO 3 ) 3 ] 1 - sheets extending in the [ ab] plane that consist of approximately linear UO 2 2+ cations bound by iodate anions to yield UO 7 pentagonal bipyramids. There are three crystallographically unique iodate anions, two of which bridge between uranyl cations to create sheets, and one that is monodentate and protrudes in between the layers in cavities. K + cations form long ionic contacts with oxygen atoms from the layers forming an eight-coordinate distorted dodecahedral geometry. These cations join the ∞ 2 [ UO 2 ( IO 3 ) 3 ] 1 - sheets together. Ion-exchange reactions have been carried out that indicate the selective uptake of Cs + over Na + or K + by 1. Crystallographic data (193 K, Mo Kα, λ = 0.71073 Å ): 1, orthorhombic, Pbca, a=11.495(1) Å, b=7.2293(7) Å, c=25.394(2) Å, Z=8, R( F)=1.95% for 146 parameters with 2619 reflections with I > 2 σ ( I ) .
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