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K(3)Al(2)As(3)O(12).

ABSTRACT: Single crystals of K(3)Al(2)As(3)O(12), tripotassium dialuminotriarsenate(V), were obtained unintentionally by the reaction of KAsO(3) with a corundum crucible at 973?K. The asymmetric unit contains three K, two Al, three As and 12 O atoms. The structure of the title compound is isotypic with those of other K(3)M'(2)X(3)O(12) (M' = Al, Ga; X = P, As) structures and is made up of a three-dimensional network of corner-sharing [AlO(4)] and [AsO(4)] tetra-hedra. The three K(+) cations are located in channels running along the [100], [001], [101] and [10[Formula: see text]] directions, exhibiting different coordination numbers of 9, 8 and 6, respectively. All corresponding [KO(x)] polyhedra are considerably distorted.

SUBMITTER: Stoger B 

PROVIDER: S-EPMC3274838 | biostudies-other | 2012 Feb

REPOSITORIES: biostudies-other

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K(3)Al(2)As(3)O(12).

Stöger Berthold B   Weil Matthias M  

Acta crystallographica. Section E, Structure reports online 20120111 Pt 2

Single crystals of K(3)Al(2)As(3)O(12), tripotassium dialuminotriarsenate(V), were obtained unintentionally by the reaction of KAsO(3) with a corundum crucible at 973 K. The asymmetric unit contains three K, two Al, three As and 12 O atoms. The structure of the title compound is isotypic with those of other K(3)M'(2)X(3)O(12) (M' = Al, Ga; X = P, As) structures and is made up of a three-dimensional network of corner-sharing [AlO(4)] and [AsO(4)] tetra-hedra. The three K(+) cations are located in  ...[more]