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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Tiekink, E. R. T.

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Volume 224, Issue 5-6

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Amine-templated uranyl selenates with chiral [(UO2)2(SeO4)3(H2O)]2– layers: topology, isomerism, structural relationships

Sergey V. Krivovichev / Vladislav V. Gurzhiy / Ivan G. Tananaev / Boris F. Myasoedov
  • 3 Russian Academy of Sciences, V. I. of Geochemistry and Analytical Chemistry, Moscow, Russische Föderation
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Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/zkri.2009.1145

Abstract

Eleven new amine-templated uranyl selenate hydrates have been prepared by evaporation from aqueous solution of uranyl nitrate, selenic acid and the respective amines. The structures of the compounds have been solved by direct methods and refined using least-squares techniques. Each structure is based upon [(UO2)2(SeO4)3(H2O)]2– layers of corner-sharing UO7 pentagonal bipyramids and SeO4 tetrahedra. The layers are based upon 4- and 6-membered rings arranged in different fashion. In topology I, 6-membered rings form edge-sharing chains, whereas, in topology II, they form corner-sharing chains. Layers with the topology II exist in two geometrical isomers that differ in the system of ‘up’ and ‘down’ orientations of tetrahedra relative to the plane of the layer. There are two isomers, one of which is chiral and the other is achiral. The layers with the topology II are chiral. Chirality is induced by the combination of orientations of tetrahedra and direction of the U → H2O bond. The analysis of the relationships between composition and shape of amine molecules and layer topology reveals two important regularities. 1. Aliphatic components of amine molecules tend to associate with 6-MRs of the inorganic layers. 2. Molecules with longer and spacious aliphatic components favor formation of the layers with topology II, whereas those with shorter aliphatic components prefer layers with the topology I.

Keywords: Uranyl selenate; Topology; Isomerism; Structural control; Chirality

About the article

* Correspondence address: St. Petersburg State University, Faculty of Geology, Dept. of Crystallography, University Emb. 7/9, 199034 St. Petersburg, Russische Föderation,


Published Online: 2009-09-25

Published in Print: 2009-05-01


Citation Information: Zeitschrift für Kristallographie International journal for structural, physical, and chemical aspects of crystalline materials, Volume 224, Issue 5-6, Pages 316–324, ISSN (Print) 0044-2968, DOI: https://doi.org/10.1524/zkri.2009.1145.

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