Crystal Structure of K[UO2(NO3)3] and Some Features of Compounds M[UO2(NO3)3] (M = K,Rb, and Cs) |
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| Authors: | Krivovichev S. V. Burns P. C. |
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| Affiliation: | (1) St. Petersburg State University, St. Petersburg, Russia;(2) University of Notre Dame, Notre Dame, Indiana, the United States |
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| Abstract: | Greenish-yellow transparent crystals of K[UO2(NO3)3] were prepared from aqueous solutions as by-product in synthesis of potassium chromatouranylates. The crystal structure was solved by the direct methods and refined to R1 = 0.037 (wR2 = 0.070) for 1452 reflections with |Fhkl|  4 |Fhkl|. Mono- clinic system, space group C2/c, a = 13.4877(10), b = 9.5843(7), c = 7.9564(6) Å,  = 116.124(2)°, V = 923.45(12) Å3. The structure of K[UO2(NO3)3] contains isolated complex ions [UO2(NO3)3]- whose uranyl groups are aligned parallel to the [-101] plane. The K+ cations, coordinated by twelve oxygen atoms, are located between the complex anions. Comparison of the structure with known data on M[UO2(NO3)3] compounds (M = K, Rb, Cs) suggests the possibility of phase transitions due to relatively small displacements of [UO2(NO3)3]- anions and K+ cations, retaining the general structural motif. |
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