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http://dx.doi.org/10.18419/opus-14291
Autor(en): | Grossholz, Hagen Buyer, Constantin Lotter, Sebastian M. A. Wolf, Sarah Schleid, Thomas |
Titel: | About lanthanoid fluoride selenide oxoselenotantalates with the composition Ln3F2Se2TaO4 (Ln = La - Nd) |
Erscheinungsdatum: | 2020 |
Dokumentart: | Zeitschriftenartikel |
Seiten: | 1588-1594 |
Erschienen in: | Zeitschrift für anorganische und allgemeine Chemie 646 (2020), S. 1588-1594 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-143104 http://elib.uni-stuttgart.de/handle/11682/14310 http://dx.doi.org/10.18419/opus-14291 |
ISSN: | 1521-3749 0044-2313 |
Zusammenfassung: | After solid-state reactions of the light lanthanoid metals, their oxides and fluorides as well as selenium in sealed tantalum ampoules with sodium chloride as a fluxing agent at 850 °C for 8 days needle-shaped single crystals of Ln3F2Se2TaO4 (Ln = La - Nd) were obtained. They crystallize in the orthorhombic space group Pnma analogous to La3F2Se2NbO4 with a = 1133-1120 pm, b = 400-393 pm and c = 1812-1778 pm (Ln = La - Nd) for Z = 4 as the first known quinary lanthanoid(III) oxoselenotantalates(V) with fluoride and selenide anions. The three crystallographically different Ln3+ cations are all surrounded by nine anions (O2-, F- and Se2-) each. Tantalum resides in an octahedral chalcogen coordination by forming trans-vertex oxygen-connected [TaO5Se]7- polyhedra, which build up chains 1∞{[TaOV2/2Ot3/1Set1/1]5-} along [010]. The sites of the four crystallographically different oxygen atoms and the two distinct fluoride anions were established by bond-valence calculations. One fluorine and three oxygen atoms are surrounded tetrahedrally by cations, while another fluoride and oxide anion exhibit just triangular non-planar coordination spheres. The two independent Se2- anions have five or six cationic neighbors. |
Enthalten in den Sammlungen: | 03 Fakultät Chemie |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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ZAAC_ZAAC202000087.pdf | 1,39 MB | Adobe PDF | Öffnen/Anzeigen |
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