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Novel Ternary Oxobromides with Ta6 Clusters and Rare Earths: The Synthesis of (RE)Ta6Br13O3 (RE = Rare Earth) and the Crystal Structure of LuTa6Br13O3

Stéphane Cordier ; Laboratoire de Chimie du Solide et Inorganique Moléculaire, URA CNRS 1495, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cédex, France
Christiane Perrin ; Laboratoire de Chimie du Solide et Inorganique Moléculaire, URA CNRS 1495, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cédex, France
Marcel Sergent ; Laboratoire de Chimie du Solide et Inorganique Moléculaire, URA CNRS 1495, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cédex, France


Puni tekst: engleski pdf 26.031 Kb

str. 781-792

preuzimanja: 225

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Sažetak

Crystallochemistry of the novel oxobromides (RE)TagBr1803 with RE = Sm to Lu (except Eu and Yb) is reported. All these compounds, which exhibit 14 valence electrons per Tag cluster, are isotypic with ScNbgCl^Og with the space group 74x22. The structure of LuTagBrxgOg has been determined from single crystal X-ray diffraction: a = 9.383(1) Å and c = 54.60(1) Å, R = 0.050 and Rw = 0.054 for 755 symmetry-independent reflections. For this compound, the (TagL18) units (L = Br and O), in which the Tag cluster is very distorted, are linked together by four bridging bromines to form pseudo-helices of units. The lutetium is five-coordinated at a small site formed by three oxygen and two bromine atoms belonging to three adjacent units. The formula developed for this compound is Lu(TagBr91031)Br2aBr4/2a_a. These structural results allow discussion of the influence of interatomic distances on the potential properties of these novel ternary tantalum oxobromides in relation to the oxidation state of the cluster.

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Hrčak ID:

136693

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https://hrcak.srce.hr/136693

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