Crystal Structure of Tl2[(UO2)2(MoO4)3] and Crystal Chemistry of the Compounds M2[(UO2)2(MoO4)3] (M = Tl, Rb, Cs) |
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| Authors: | E. V. Nazarchuk S. V. Krivovichev P. C. Burns |
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| Affiliation: | (1) St. Peteresburg State University, St. Petersburg, Russia;(2) Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, the United States |
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| Abstract: | A new compound, Tl2[(UO2)2(MoO4)3], was prepared by a solid-phase reaction. The compound crystallizes in a rhombic system, space group Pna21, a = 20.1296(9), b = 8.2811(4), c = 9.7045(4), V = 1617.69(13) Å3, Z = 4. The crystal structrue was solved by the direct method and refined to R 1 = 0. 04 for 4884 unique reflections. The structural motif is a framework consisting of UO7 pentagonal bipyramids and MoO4 tetrahedra. The Tl coordination polyhedra are irregular, with seven and eight vertices. Large channels of the size 6 × 10.8 Å, occupied by Tl+ cations, are arranged parallel to the [001] direction. The compound is isostructural to the previously described α-Cs2(UO2)2(MoO4)3 and Rb2(UO2)2 (MoO4)3. __________ Translated from Radiokhimiya, Vol. 47, No. 5, 2005, pp. 408–411. Original Russian Text Copyright ? 2005 by Nazarchuk, Krivovichev, Burns. |
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