Abstract
The title compounds have been prepared from the elemental lanthanoids and arsenic sesquioxide in 1:1 and 2:3 molar ratios in the presence of a cesium-halide flux at temperatures near 1000 °C generating elemental arsenic as the by-product. With the preparation of B-type La[AsO3] crystallizing in the monoclinic space group P21/c with the lattice parameters a = 904.03(8), b = 789.96(7), c = 837.49(7) pm and β = 103.354(3)°, both A- and B-type Ln[AsO3] representatives are now available for lanthanum and cerium. The crystal structure consists of two crystallographically distinct Ln
3+ cations with eight- or ninefold coordination by O2− anions. The Ln
3+ cations are arranged in layers of (Ln1)3+ and corrugated bilayers of (Ln2)3+ cations in the (100) plane. The two different As3+ cations appear in [AsO3]3− units, which differ mainly in their environment of Ln
3+ cations. The successful synthesis of the compounds Ln
2As4O9 (Ln = Pr, Nd, Eu and Gd) reported here on the one hand closes the structural gap between cerium and neodymium, and on the other hand also extends the spectrum of ternary oxoarsenates(III) of lanthanoids to gadolinium, with the neodymium compound for the first time at standard temperature. The crystals of the Ln
2As4O9 compounds are triclinic (space group:
Dedicated to: Professor Michael Ruck on the occasion of his 60th birthday.
Danksagung
Wir danken Herrn Dr. Falk Lissner (AOR, Universität Stuttgart) für die Einkristallmessungen.
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Forschungsethik: Entfällt.
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Autorenbeiträge: Die Autoren übernehmen die Verantwortung für den gesamten Inhalt dieses Manuskripts und haben die Einreichung genehmigt.
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Erklärung zum Interessenkonflikt: Die Autoren erklären, dass keine Interessenkonflikte in Bezug auf diesen Artikel existieren.
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Forschungsförderung: Keine Angaben.
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Datenverfügbarkeit: Entfällt.
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