Crystal Chemistry of the Potassium and Rubidium Uranyl Borate Families Derived from Boric Acid Fluxes

Wang, S. A., Alekseev, E. V., Stritzinger, J. T., Depmeier, W. and Albrecht-Schmitt, T. E. (2010) Crystal Chemistry of the Potassium and Rubidium Uranyl Borate Families Derived from Boric Acid Fluxes Inorganic Chemistry, 49 (14). pp. 6690-6696. DOI 10.1021/ic100728s.

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Abstract

The reaction of uranyl nitrate with a large excess of molten boric acid in the presence of potassium or rubidium nitrate results in the formation of three new potassium uranyl borates, K(2)[(UO(2))(2)B(12)O(19)(OH)(4)] center dot 0.3H(2)O (KUBO-1), K[(UO(2))(2)-B(10)O(15)(OH)] (KUBO-2), and K[(UO(2))(2)B(10)O(18)(OH)(3)] center dot 0.7H(2)O (KUBO-3) and two new rubidium uranyl borates Rb(2)[(UO(2))(2)B(13)O(20)(OH)(5)] (RbUBO-1) and Rb[(UO(2))(2)B(10)O(16)(OH)(3)] center dot 0.7H(2)O (RbUBO-2). The latter is isotypic with KUBO-3. These compounds share a common structural motif consisting of a linear uranyl, UO(2)(2+), cation surrounded by BO(3) triangles and BO(4) tetrahedra to create an UO(8) hexagonal bipyramidal environment around uranium. The borate anions bridge between uranyl units to create sheets. Additional BO(3) triangles extend from the polyborate layers and are directed approximately perpendicular to the sheets. All of these compounds adopt layered structures. With the exception of KUBO-1, the structures are all centrosymmetric. All of these compounds fluoresce when irradiated with long-wavelength UV light. The fluorescence spectrum yields well-defined vibronically coupled charge-transfer features.

Document Type: Article
Keywords: ion-exchange properties 3-dimensional framework hydrothermal syntheses coordination polymers magnetic-properties nuclear-waste u6+ minerals uranium phosphate insights
Research affiliation: Kiel University
Refereed: Yes
DOI etc.: 10.1021/ic100728s
ISSN: 0020-1669
Date Deposited: 22 Dec 2011 06:00
Last Modified: 28 Mar 2018 10:23
URI: http://eprints.uni-kiel.de/id/eprint/15727

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