Lead rare-earth oxyhalides: Syntheses and characterization of Pb6LaO7X (X = Cl, Br)

Siidra, O. I., Krivovichev, S. V., Armbruster, T. and Depmeier, W. (2007) Lead rare-earth oxyhalides: Syntheses and characterization of Pb6LaO7X (X = Cl, Br) Inorganic Chemistry, 46 (5). pp. 1523-1525. DOI 10.1021/ic062191y.

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Abstract

Yellowish elongated crystals of the two new compounds Pb6LaO7Br (1) and Pb6LaO7Cl (2) have been obtained by the method of solid-state reactions. Both structures can be described in the terms of oxo-centered tetrahedra. The structures of 1 and 2 consist of [O7Pb6La](+) chains that are built from oxocentered OA(4) (A = Pb, La) tetrahedra. The halogen ions connect the chains through weak Pb-X bonds. An arrangement of eight OA(4) tetrahedra that all share the same central La atom forms a [O8Pb10La3](13+) cluster. The clusters are linked into chains, and additional OPb4 tetrahedra are attached to the chains. Incorporation of Cl atoms instead of Br atoms into the structure causes a lowering of the symmetry from Cmcm to C2/m.

Document Type: Article
Keywords: bond-valence parameters 1d single-chain crystal-structure structural characterization international experience bi3+/m2+ oxyphosphate continuous series oxide chlorides reducing lead 2d planes
Research affiliation: Kiel University
DOI etc.: 10.1021/ic062191y
ISSN: 0020-1669
Date Deposited: 12 Jan 2012 05:18
Last Modified: 08 Oct 2012 10:21
URI: http://eprints.uni-kiel.de/id/eprint/15952

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