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- Title
Comparative study of the flexibility of structural complexes in uranyl sulfates, chromates, and molybdates.
- Authors
Krivovichev, S. V.
- Abstract
Comparative study of the flexibility of structural complexes in uranyl sulfates, chromates, and molybdates involves statistical analysis of the U-Obr-T bond angles and T-O bond lengths in TO4 tetrahedra. The analysis is based on the available high-precision (R1<0.06) crystal structure data. The mean bond lengths in the TO4 tetrahedra are 1.473(1), 1.647(3), and 1.762(2) Å for T = S, Cr, and Mo, respectively. The T-Obr bonds with bridging oxygen atoms are, as a rule, longer than the T-Ot bonds with the terminal oxygen atoms. Analysis of the distribution of U-Obr-T bond angles suggests increased flexibility of the U-Obr-Mo units compared to the corresponding units in the sulfates and chromates, which is responsible for the greater structural diversity of uranyl molybdates, with formation of framework structures being possible. The mean angles <U‐Obr-T> are within 141.1°-142.6°.
- Subjects
URANIUM compounds; SULFATES; MOLYBDATES; POLYHEDRA; TETRAHEDRA
- Publication
Radiochemistry, 2004, Vol 46, Issue 5, p434
- ISSN
1066-3622
- Publication type
Article
- DOI
10.1007/s11137-005-0004-y