Abstract
Mg 3ReH 7 and its deuteride were synthesized by the reaction of magnesium and rhenium powders at 510–520 °C and 120–155 bar hydrogen (deuterium) pressure and characterized by X-ray and neutron powder diffraction. They crystallize with hexagonal symmetry (space group P6 3/ mmc (No. 194); hydride: a = 4.8615(2) A ̊ , c = 10.5937(5) A ̊ ; deuteride: a = 4.8539(2) A ̊ , c = 10.5699(7) A ̊ ). The structure contains a nearly regular octahedral 18-electron [ReD 6] 5− complex anion with bond distances [Re-6D1] = 1.724(4) A ̊ and a D − anion coordinated by five magnesium atoms in a trigonal bipyramidal configuration with bond distances [ D2-2 Mg1] = 1.901(4) A ̊ and [ D2–3 Mg2] = 2.8024(1) A ̊ .
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