Complex topology of uranyl polyphosphate frameworks: Crystal structures of alpha-, beta-K (UO(2))(P(3)O(9)) and K (UO(2))(2)(P(3)O(10))

Alekseev, E. V., Krivovichev, S. V., Depmeier, W. and Knorr, K. (2008) Complex topology of uranyl polyphosphate frameworks: Crystal structures of alpha-, beta-K (UO(2))(P(3)O(9)) and K (UO(2))(2)(P(3)O(10)) Zeitschrift Fur Anorganische Und Allgemeine Chemie, 634 (9). pp. 1527-1532. DOI 10.1002/zaac.200700384.

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Abstract

Three new uranyl polyphosphates, alpha-K[(UO(2))(P(3)O(9))] (1), beta-K[(UO(2))(P(3)O(9))] (2), and K[(UO(2))(2)(P(3)O(10))] (3), were prepared by high-temperature solid-state reactions. The crystal structures of the compounds have been solved by direct methods: 1 - monoclinic, P2(1)/m, a = 8.497(1), b = 15.1150(1), c = 14.7890(1) angstrom, beta = 91.911(5)degrees, V = 1898.3(3) angstrom(3), Z = 4, R(1) = 0.0734 for 4181 unique reflections with vertical bar F(0)vertical bar >= 4 sigma(F); 2 - monoclinic, P2(1)/n, a = 8.607(1), b = 14.842(2), c = 14.951 (1) angstrom, beta = 95.829(5)degrees, V = 1900.0(4) angstrom(3), Z = 4: R(1) = 0.0787 for 3185 unique reflections with vertical bar F(0)vertical bar >= 4 sigma(F); 3 -- Pbcn, a = 10.632(1): b = 10.325(1), c = 11.209(1) angstrom, V = 1230.5(2) angstrom(3), Z = 4, R(1) = 0.0364 for 1338 unique reflections with vertical bar F(0)vertical bar >= 4 sigma(F) In the structures of 1 and 2, phosphate tetrahedra share corners to form infinite [PO(3)](-) chains, whereas, in the structure of 3, tetrahedra form linear [P(3)O(10)](5-) trimers. The structures are based upon 3-D frameworks of U and P polyhedra linked by sharing common 0 corners. The infinite [PO(3)](-) chains in the structures of 1 and 2 are parallel to [100] and [-101], respectively. The uranyl polyphosphate frameworks are occupied by host K(+) cations.

Document Type: Article
Keywords: uranyl polyphosphates crystal structure topology combinatorial polymorphism bond-valence parameters autunite group parsonsite chemistry minerals uranium
Research affiliation: Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
DOI etc.: 10.1002/zaac.200700384
ISSN: 0044-2313
Date Deposited: 12 Jan 2012 06:06
Last Modified: 09 Oct 2012 03:56
URI: http://eprints.uni-kiel.de/id/eprint/15566

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