ISSN:
0044-2313
Keywords:
Ternary Lanthanide Chlorides
;
Synthesis
;
Crystal Structures
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Ternary Halides of the A3MX6 Type I. A3YCI6 (A = K, NH4, Rb, Cs): Synthesis, Structures, Thermal Behaviour. Some Analogous Chlorides of the LanthanidesReaction of the trichlorides MCl3 (M = Y, Tb—Lu) with alkali chlorides AC1 (A = K, Rb, Cs) in evacuated silica ampoules at 850-900°C yields A3MCl6-type chlorides. (NH4)3YCl6 is obtained via the ammonium-chloride route. The crystal structure of Rb3YCl6 (monoclinic, C2/c (no. 15), Z = 8, a = 2583(1)pm, b = 788.9(4)pm, c = 1283.9(7)pm, p = 99.63(4)°, R = 0.062, Rw = 0.050) is that of Cs3BiCl6. The Rb3YCl6/Cs3BiCl6 structure and the closely related structures of K3MoCl6 and In2CI3 are derived from the elpasolite-type of structure (K2NaAlF6) making use of the model of closest-packed layer structures. Cell parameters for the chlorides Rb3MCl6 (M = Y, Tb—Lu) and Cs3YCl6 and Cs3ErCl6 as well, which are all isostructural with Rb3YCl6, are given. The “system” (K, NH4, Rb, Cs)YCl6 has been investigated by DTA and high-temperature X-ray powder diffractometry.
Notes:
Chloride vom Typ A3MCl6 (A = K, Rb, Cs; M = Y, Tb—Lu) werden durch Umsetzung der Trichloride MCl3 mit Alkalichloriden ACl in evakuierten Quarzglas-Ampullen bei 850-900°C dargestellt, (NH4)3YCl6 nach der “Ammoniumchlorid-Methode”. Die Röntgenstrukturanalyse an einem Einkristall von Rb3YCl6 (monoklin, C2/c (Nr. 15), Z = 8, a = 2583(1) pm, b = 788,9(4) pm, c = 1283,9(7) pm, β = 99,63(4)°, R = 0,062, Rw = 0,050) ergab Isotypie zu Cs3BiCl6. Ausgehend vom Elpasolith-Typ (K2NaAlF6) werden Cs3BiCl6 und nahe verwandte Strukturen (K3MoCl6, In2Cl3) mit dem Modell dichtest gepackter Schichten beschrieben. Für die zu Rb3YCl6 isotypen Chloride Rb3MCl6 (M = Y, Tb—Lu), sowie Cs3YCl6 und Cs3ErCl6 werden Gitterkonstanten angegeben. Das “System” (K, NH4, Rb, Cs)YCl6 wurde mittels DTA und Heiz-Guinier-Aufnahmen untersucht.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19926180103
