ISSN:
0044-2313
Keywords:
Tetrapnictidometallates(IV)
;
Tetrapnictidotantalates(V)
;
Na6ZnO4 structure type
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
New Tetrapnictidometallates of Silicon, Germanium, Tin, and Tantalum with the Na6ZnO4 StructureThe tetrapnictidometallates(IV) Na3M3EIVX4 (M = Na/Ca, Na/Sr, Na/Eu; E = Si, Ge, Sn and X = P, As) were prepared from NaX, M′X (M′ = Ca, Sr, Eu) and elemental E in tantalum ampoules at temperature of 1270 K. The tetrapnictidotantalates(V) Na3(Na2Eu)TaP4 and Na3(Na2Eu)TaAs4 were formed by a reaction with the walls of the ampoule. All compounds crystallise hexagonal in the Na6ZnO4 structure type hP22 (P63mc; no. 186; Z = 2) with polar orientated tetrahedron anions [SiX4]8-, [GeX4]8-, [SnX4]8- and [TaX4]7-. The average bondlengths are: d̄(Si—P) = 230.4 pm; d̄(Si—As) = 239.9 pm; d̄(Ge—P) = 237.1 pm; (Ge—As) = 247.8 pm; d̄(Sn—P) = 252.3 pm; d̄(Sn—As) = 261.4 pm; d̄(Ta—P) = 238.3 pm; d̄(Ta—As) = 247.4 pm.
Notes:
Die Tetrapnictidometallate(IV) Na3M3EIVX4 (M = Na/Ca, Na/Sr, Na/Eu; E = Si, Ge, Sn und X = P, As) wurden aus NaX, M'X (M′ = Ca, Sr, Eu) und elementarem E (Tantalampullen, 1270 K) synthetisiert. Die Tetrapnictidotantalate(V) Na3(Na2Eu)TaP4 und Na3(Na2Eu)TaAs4 entstanden bei Wandreaktionen mit dem Ampullenmaterial. Alle Verbindungen kristallisieren hexagonal im Na6ZnO4-Strukturtyp hP22 (P63mc, Nr. 186, Z = 2) mit polar ausgerichteten Tetraederanionen [SiX4]8-, [GeX4]8-, [SnX4]8- und [TaX44]7-. Die mittleren Bindungslängen sind: d̄(Si—P) = 230.4 pm, d̄(Si—As) = 239.9 pm, d̄(Ge—P) = 237.1 pm, d̄(Ge—As) = 247.8 pm, d̄(Sn—P) = 252.3 pm, d̄(Sn—As) = 261.4 pm, d̄(Ta—P) = 238.3 pm, d̄(Ta—As) = 247.4 pm.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19976230134
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