ISSN:
0009-2940
Keywords:
cyclo-Tetraselenium(2+)
;
cyclo-Tetratellurium(2+)
;
Hexachlorozirconate(IV)
;
Hexachlorohafnate(IV)
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Selenium, SeCl4, and MCl4 (M = Zr, Hf) react in a sealed evacuated glass ampoule at 130°C to afford red, moisture sensitive crystals of Se2+4(ZrCl2-6) and Se2-6(HfCl2-6). The isotypic crystal structures (tetragonal, P42/ncm, Z = 4) consist of square-planar Se2+4 cations and slightly distorted octahedral MCl2-6 (M = Zr, Hf) anions. The ions are packed corresponding to the NaCl structure type with the centres of gravity of the Se4 rings and the metal atoms of the MCl6 octahedra in the Na and Cl positions. From Te, TeCl4, and HfCl4 one obtains under similar conditions at 200°C Te2+4 (HfCl2-6) in form of dark violet crystals. The crystal structure (triclinic, P1, Z = 1) is built of nearly square-planar Te2+4 ions and octahedral HfCl2-6 ions. The packing of the ions corresponds to a rhombohedrally distorted CsCl structure type.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19951280804
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