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Crystals 2011, 1(1), 15-21; doi:10.3390/cryst1010015
Article

The First Lanthanide Telluride-Bromide: La3Te4Br, a Valence Compound

1
,
2
 and
1,*
1 Department für Chemie, Universität zu Köln, Greinstraße 6, D-50939 Köln, Germany 2 Fakultät für Chemie, Ruhr-Universität Bochum, D-44780 Bochum, Germany
* Author to whom correspondence should be addressed.
Received: 21 February 2011 / Revised: 10 March 2011 / Accepted: 18 March 2011 / Published: 21 March 2011
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Abstract

The first ternary lanthanide telluride-bromide La3Te4Br was obtained from a mixture of LaTe and LaBr3 (in the presence of iridium) in a sealed tantalum container at elevated temperatures. The crystal structure (orthorhombic, Pnma, a = 1634.3(2), b = 435.0(1), c = 1426.6(2) pm, Z = 4, R1 (I0 > 2s(I0)) = 0.0349) is built from dicapped trigonal prisms of tellurium and bromine atoms surrounding lanthanum in two different ways. The dicapped trigonal prisms are connected via common edges to a threedimensional structure, in the same fashion as is known for the binary U3Te5. La3Te4Br is a valence compound according to (La3+)3(Te2-)4(Br-) and one out of three lanthanide telluride-halides known to date.
Keywords: Lanthanum; Telluride-bromide; Synthesis; Crystal structure Lanthanum; Telluride-bromide; Synthesis; Crystal structure
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Larres, M.; Mudring, A.-V.; Meyer, G. The First Lanthanide Telluride-Bromide: La3Te4Br, a Valence Compound. Crystals 2011, 1, 15-21.

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