ChemInform Abstract: Trigonal SrAl2H2: The First Zintl Phase Hydride

Autor: F. Gingl, Etsuo Akiba, Thomas Vogt
Rok vydání: 2000
Předmět:
Zdroj: ChemInform. 31
ISSN: 1522-2667
0931-7597
DOI: 10.1002/chin.200039003
Popis: The title compound and its deuteride were synthesized by hydrogenating/deuterating SrAl 2 at 50 bar H 2 /D 2 pressure and temperatures below 200°C. As found by in situ X-ray powder diffraction, the hydrogenation of SrAl 2 proceeds in three steps, with SrAl 2 H 2 as the first product. SrAl 2 H 2 and SrAl 2 D 2 were characterized by X-ray and neutron powder diffraction. They crystallize with a new trigonal structure in space group P3m1 (164), cell parameters: a =4.5283(1) A, c =4.7215(2) A (hydride), a =4.5253(1) A, c =4.7214(2) A (deuteride), Z =1. The main feature of this structure is a two-dimensional polymer Zintl anion, ∞ 2 [AlH − ] 2 n , in which one H atom is covalently bonded to each Al atom. SrAl 2 H 2 is the first example of a Zintl phase hydride, i.e., the first Zintl phase in which hydrogen atoms are a part of the Zintl anion.
Databáze: OpenAIRE
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