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Crystal Data for (NH 4 ) 3 AsCr 4 O 16 and K 3 AsCr 4 O 16 the first examples of quaternary arsenic
Author(s) -
AverbuchPouchot M.T.,
Durif A.
Publication year - 1981
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19814760528
Subject(s) - tetrahedron , monoclinic crystal system , salt (chemistry) , crystallography , ammonium , crystal (programming language) , ion , potassium , arsenic , crystal structure , chemistry , quaternary , unit (ring theory) , inorganic chemistry , materials science , geology , computer science , mathematics , organic chemistry , paleontology , mathematics education , programming language
We describe chemical preparations and give crystal data for two new arsenatochromates: (NH 4 ) 3 AsCr 4 O 16 and K 3 AsCr 4 O 16 isotypic with K 3 PCr 4 O 16 . Both are monoclinic (Cc) with the following unit cells: a = 9.724(5), b = 11.98(5), c = 14.88(5)Å, β 105.82(5)º for the ammonium salt and a = 9.323(5), b = 12.03(5), c = 14.62(5) Å, β 105.25 (5)º for the potassium salt. The main feature of these salts is the geometrical configuration of the finite AsCr 4 O 16 anion: a central AsO 4 tetrahedron sharing its four corners with CrO 4 tetrahedra. Up to now, these salts are the first example of a quaternary arsenic in a finite anion.