The modular structure of the novel uranyl sulfate sheet in [Co(H2O)6]3[(UO2)5(SO4)8(H2O)](H2O)5

被引:8
作者
Krivovichev, Sergey V. [1 ]
Burns, Peter C. [2 ]
机构
[1] St Petersburg State Univ, Dept Crystallog, St Petersburg 199034, Russia
[2] Univ Notre Dame, Dept Civil & Environm Engn & Earth Sci, Notre Dame, IN 46556 USA
基金
俄罗斯基础研究基金会;
关键词
uranyl sulfate; crystal structure; hydrothermal methods; structure topology; BOND-VALENCE PARAMETERS; CRYSTAL-STRUCTURE; ZIPPEITE-GROUP; CHEMISTRY; JACHYMOV; PSEUDOJOHANNITE; MINERALOGY; CHROMATES; MOLYBDATE; TOPOLOGY;
D O I
10.3190/jgeosci.164
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A new uranyl sulfate, [Co(H2O)(6)](3)[(UO2)(5)(SO4)(8)(H2O)](H2O)(5), has been synthesized using mild hydrothermal methods. The structure (monoclinic, P2(1)/c, a = 27.1597(14), b = 9.9858(5), c = 22.7803(12) angstrom, beta = 106.520(1)degrees, V = 5923.2(5) angstrom(3), Z = 4) has been solved by direct methods and refined on the basis of F-2 for all unique reflections to R-1 = 0.056, calculated for the 9124 unique observed reflections (vertical bar F-o vertical bar >= 4 sigma(F)). It contains five symmetrically distinct uranyl pentagonal bipyramids and eight sulfate tetrahedra that link via the sharing of vertices between uranyl polyhedra and sulfate tetrahedra, resulting in sheets parallel to (001). Adjacent sheets are linked by hydrogen bonds to Co2+(H2O)(6) octahedra and H2O groups located in the interlayer. The uranyl sulfate sheet contains four- and five-connected uranyl pentagonal bipyramids and three- and four-connected sulfate tetrahedra. The sheet may be constructed using modules from related structures involving pentagonal bipyramids and tetrahedra, and is readily described using a nodal representation. In general, the uranyl sulfate sheets in [Co(H2O)(6)](3)[(UO2)(5)(SO4)(8)(H2O)](H2O)(5) are more rigid than the structural units typically found in comparable uranyl molybdates, which involve the sharing of vertices between uranyl pentagonal bipyramids and molybdate tetrahedra.
引用
收藏
页码:135 / 143
页数:9
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