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Dipotassium Sodium Diantimonidoindate, K 2 Na[InSb 2 ], a compound with the polyanion ∞ 2 [In 2 Sb 2 Sb 4/2 ] 6−
Author(s) -
CarrilloCabrera Wilder,
CarocaCanales Nubia,
Von Schnering Hans Georg
Publication year - 1993
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.19936191015
Subject(s) - crystallography , crystal structure , structure type , ampoule , x ray crystallography , space group , chemistry , type (biology) , metal , single crystal , niobium , materials science , diffraction , physics , optics , ecology , organic chemistry , biology
The novel compound K 2 Na[InSb 2 ] was synthesized from the elements at 900 K in sealed niobium ampoules. The compound forms plate‐like crystals with silver metallic luster, which are very unstable in air and moisture. The crystal structure of K 2 NaInSb 2 has been determined using single‐crystal X‐ray diffraction methods (space group Cmca (No. 64); a = 14.032(2), b = 16.399(3), c = 7.009(1) Å; Z = 8; Pearson symbol oC 48). The structure contains pairs of edge‐sharing InSb 4 tetrahedra which are linked to four other pairs via common vertices and form a two‐dimensional ∞ 2 [In 2 Sb 2 Sb 4/2 ] 6− anionic partial structure. The resulting pairs of tetrahedral holes are filled by Na + cations. These [In 2 Sb 2 Sb 4/2 ] 6− layers are stacked along the b ‐axis and are interconnected by K + cations. The whole structure can be considered as an ordered derivative of the KMnP structure (PbFCl type).