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

Crystals

Markus Larres²  Anja-Verena Mudring¹ 

[1] Fakultät für Chemie, Ruhr-Universität Bochum, D-44780 Bochum, Germany; E-Mail:;Department fur Chemie, Universität zu Köln, Greinstraβe 6, D-50939 Köln, Germany; E-Mail:

关键词: lanthanum;    telluride-bromide;    synthesis;    crystal structure;   

DOI  :  10.3390/cryst1010015

来源: mdpi

【 摘 要 】

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 > 2σ(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 three-dimensional structure, in the same fashion as is known for the binary U₃Te₅. La₃Te₄Br is a valence compound according to (La³⁺)₃(Te^2-)₄(Br^-) and one out of three lanthanide telluride-halides known to date.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.