ISSN:
0044-2313
Keywords:
Aurides
;
anti perovskites
;
alkali metal halide oxides
;
K3BrO, K3IO, K3AuO, Rb3BrO, Rb3IO, Rb3AuO, Cs3BrO, Cs3IO, Cs3AuO
;
crystal structure
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
On the Crystal Chemical Similarity of Auride and Halide AnionsThe crystallographic properties of the aurides M3AuO and the alkalimetal halide oxides M3XO (M = K, Rb, Cs; × = Br, I) are compared. Rb3BrO, Rb3IO, Cs3BrO, and Cs3IO have been prepared and characterized for the first time: Rb3BrO (a = 5.465(1) Å) crystallizes as a cubic anti perovskite, Cs3BrO (a = 7.800(6), c = 7.122(6) Å) and Cs3IO (a = 8.056(3), c = 7.168(3) Å) as hexagonal anti perovskites, Rb3IO (a = 7.889(1), c = 19.640(1) Å) as a hexagonal anti BaTiO3 type. The analysis of bond lengths, molar volumes and the systematic of the crystal structures leeds to the conclusion, that the crystallographic properties of auride- and bromide anions are similar. The radius of the Au- has been found to be 2.2 Å (KZ 12).
Notes:
Verglichen werden die kristallographischen Eigenschaften der Auride M3AuO und der Alkalimetallhalogenidoxide M3XO (M = K, Rb, Cs; × = Br, I). Rb3BrO, Rb3IO, Cs3BrO und Cs3IO werden erstmals dargestellt und strukturell charakterisiert: Rb3BrO (a = 5,465(1) Å) kristallisiert als kubischer anti-Perowskit, Cs3BrO (a = 7,800(6), c = 7,122(6) Å) und Cs3IO (a = 8,056(3), c = 7,168(3) Å) als hexagonale anti-Perowskite, Rb3IO (a = 7,889(1), c = 19,640(1) Å) im hexagonalen anti-BaTiO3-Typ. Die Analyse der Bindungsabstände und Molvolumina sowie die Systematik der Kristallstrukturen der Verbindungen M3YO (M = K, Rb, Cs; Y = Br, I, Au) belegen die kristallchemische Ähnlichkeit von Aurid- und Bromid-Ionen. Der Wirkungsradius des Au--Ions kann zu 2,2 Å (KZ 12) abgeschätzt werden.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19956211113
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