Abstract
Abstract SrMg2FeH8 and its deuteride were synthesized by reacting alkaline earth alloy powders of nominal composition SrMg2.2 with iron powder at 490–510 °C and 130–140 bar hydrogen (deuterium) pressure, and characterized by X-ray and neutron powder diffraction. The compounds crystallize with a new trigonal structure type, space group P3m1, and lattice parameters a = 4.5174(2) A and c = 6.5807(4) A (hydride), a = 4.5072(2) A and c = 6.5663(4) A (deuteride). The structure contains two types of deuterium atoms, one surrounding iron in an octahedral configuration with bond distances [ Fe-D1 ] = 1.578(4) A , and the other situated in a tetrahedral hole formed by one magnesium and three strontium atoms with bond distances [ Mg-D2 ] = 1.919(7) A , [ Sr-D2 ] = 2.662(1) A . The limiting ionic formula SrD2 - Mg22+[FeD6]4- suggests that the transition metal complex conforms to the 18-electron rule.
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