Synthesis and Crystal Structure of the First Thallium Hydrous Nesosilicate Tl(4)SiO(4)center dot 0.5H(2)O

Britvin, S. N., Siidra, O. I., Krivovichev, S. V. and Depmeier, W. (2009) Synthesis and Crystal Structure of the First Thallium Hydrous Nesosilicate Tl(4)SiO(4)center dot 0.5H(2)O Zeitschrift Fur Anorganische Und Allgemeine Chemie, 635 (3). pp. 518-522. DOI 10.1002/zaac.200801311.

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Abstract

Orange prismatic crystals of the first thallium hydrous nesosilicate Tl(4)SiO(4)center dot 0.5H(2)O have been obtained by evaporation from aqueous Solution. There are three symmetrically independent Tl(+) cations and five symmetrically independent oxygen atoms in the structure of Tl(4)SiO(4)center dot 0.5H(2)O. The O(4) and O(5) atoms belong to water molecules. Coordination polyhedra of the Tl(+) cations are strongly distorted because of the stereoactive behavior of lone electron pairs. The structure of Tl(4)SiO(4)center dot 0.5H(2)O contains sheets of SiO(4) tetrahedra and Tl coordination polyhedra. The sheets have the composition [Tl(3)SiO(4)](-) and are parallel to [100]. Within the sheets, SiO(4) tetrahedra link to thallium polyhedra though common corners. The sheets are linked by dimers of face-sharing Tl(3)O(5) polyhedra. thus providing interconnection of the sheets into a framework. The framework has large elliptical channels occupied by water molecules (OW2) and electron pairs of Tl(+) cations. The comparison with some other M(+) (M = K, Ag, Tl) silicates is given.

Document Type: Article
Keywords: Thallium Silicates Lone pair Crystal engineering bond-valence parameters uranyl molybdates pair chemistry minerals
Research affiliation: Kiel University
DOI etc.: 10.1002/zaac.200801311
ISSN: 0044-2313
Date Deposited: 22 Dec 2011 05:41
Last Modified: 08 Oct 2012 10:09
URI: http://eprints.uni-kiel.de/id/eprint/15762

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