ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
On the KAgO-Structure. Reinvestigation of AAgO = A4[Ag4O4] (A = Na—Rb). With a Note on CsCuO and New Calculations on A4[M4O4] (A = Li—Rb with M = Cu and A = Cs with M = Ag)By heating of well ground mixtures of the oxides [K2O, KMnO4, K:Mn = 7,8:1 Ag-tube; 7 d 800°C, 35 d 600°C] we obtained once more by “reaction at the metallic substrate” (i. e. the wall) KAgO [2] as colourless, tetragonal single crystals. The review of the structure yields in opposite to earlier acceptance I4/mmm as centric space group. The “ring” [Ag4O4] is exactly plane, parameters see text.Under these circumstances Na4[Ag4O4] [1] and Rb4[Ag4O4] [3] were prepared again and investigated by X-ray. With this knowledge the other examples of the KAgO-typ have been calculated again by old data (for parameters see text).
Notes:
Beim Tempern inniger Gemenge der Oxide [K2O, KMnO4, K:Mn = 7,8:1 Ag-Bömbchen, diese unter Argon in Quarz; 7 d 800°C, 35 d 600°C] erhielt man erneut durch „Wandreaktion“ KAgO [2] in Form praktisch farbloser, tetragonaler Einkristalle. Die Überprüfung der Kristallstruktur ergab entgegen früheren Annahmen die zentrische Raumgruppe I4/mmm. Die Baugruppe [Ag4O4] ist dann aber exakt planar (Parameter vergleiche Text).Daraufhin wurden Na4[Ag4O4] [1] und Rb4[Ag4O4] [3] erneut dargestellt und röntgenographisch untersucht. Die restlichen Vertreter des KAgO-Types wurden anhand der alten Datensätze erneut überprüft (Parameter siehe Text).
Additional Material:
11 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19905850109
