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- Title
Crystal Structure of K[UO<sub>2</sub>(NO<sub>3</sub>)<sub>3</sub>] and Some Features of Compounds M[UO<sub>2</sub>(NO<sub>3</sub>)<sub>3</sub>] (M = K, Rb, and Cs).
- Authors
Krivovichev, S.V.; Burns, P.C.
- 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¦ ≥ 4σ ¦Fhkl¦. Monoclinic system, space group C2/c, a = 13.4877(10), b = 9.5843(7), c = 7.9564(6) Å, Β = 116.124(2)°, V = 923.45(12) ų. 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.
- Subjects
URANIUM compounds; CRYSTALS; INORGANIC synthesis; OPTICAL reflection; IONS; PHASE transitions
- Publication
Radiochemistry, 2004, Vol 46, Issue 1, p16
- ISSN
1066-3622
- Publication type
Article
- DOI
10.1023/B:RACH.0000024628.59029.0d