Journal
STRUCTURAL CHEMISTRY
Volume 23, Issue 6, Pages 2003-2017Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11224-012-0001-7
Keywords
Uranium; Selenium; Methylamine; Uranyl oxysalts; Crystal structure; Single crystal X-ray diffraction; Topology; Dimensional reduction
Funding
- RFBR [12-03-90711]
- St. Petersburg State University [3.37.84.2011]
- X-Ray Diffraction Resource Center
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Single crystals of eight novel uranyl selenates, (CH3NH3)(2)[(UO2)(SeO4)(2)(H2O)](H2O) (I) and (CH3NH3)(2)[(UO2)(SeO4)(2)(H2O)] (II), (CH3NH3)(2)[(UO2)(2)(SeO4)(3)] (III) and (CH3NH3)(H3O)[(UO2)(2)(SeO4)(3)(H2O)](H2O) (IV), (CH3NH3)(4)[(UO2)(3)(SeO4)(5)](H2O)(4) (V) and (CH3NH3)(H5O2)(H3O)(2)[(UO2)(3)(SeO4)(5)](H2O)(4) (VI), (CH3NH3)(4)(H3O)(2)[(UO2)(5)(SeO4)(8)(H2O)](H2O)(4) (VII), and (CH3NH3)(1.5)(H5O2)(1.5)(H3O)(3)[(UO2)(5)(SeO4)(8)(H2O)](H2SeO4)(2.6)(H2O)(3) (VIII), have been prepared by isothermal evaporation from aqueous solutions and structurally characterized. The observed structural topologies of uranyl selenate units have been investigated using graph theory. The principle of dimensional reduction has been used for analysis of the uranyl oxysalts with general chemical formula A (n) (UO2) (p) (TO4) (q) (H2O) (r) (A = monovalent cation, and T = S, Se, Cr, Mo), which allowed to construct three-component composition-structure diagram with separate dimensionality fields for different chemical compositions.
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