Structural topology and dimensional reduction in uranyl oxysalts: eight novel phases in the methylamine-(UO2)(NO3)2-H2SeO4-H2O system

被引：21
|
作者：
Kovrugin, Vadim M. [1 ]
Gurzhiy, Vladislav V. [1 ]
Krivovichev, Sergey V. [1 ,2 ]
机构：
[1] St Petersburg State Univ, Fac Geol, Dept Crystallog, St Petersburg 199034, Russia
[2] Russian Acad Sci, Inst Silicate Chem, St Petersburg 199034, Russia
来源：
STRUCTURAL CHEMISTRY | 2012年 / 23卷 / 06期
关键词：
Uranium; Selenium; Methylamine; Uranyl oxysalts; Crystal structure; Single crystal X-ray diffraction; Topology; Dimensional reduction; CRYSTAL-STRUCTURE; GEOMETRICAL ISOMERISM; NEUTRON-DIFFRACTION; SULFATE DIHYDRATE; U6+ MINERALS; CHEMISTRY; URANIUM; MOLYBDATES; SELENATES; SHEETS;
D O I：
10.1007/s11224-012-0001-7
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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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收藏
页码：2003 / 2017
页数：15
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