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Mg6Ir2H11, a new metal hydride containing saddle-like [IrH4]5− and square-pyramidal [IrH5]4− hydrido complexes

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Published in Journal of Alloys and Compounds. 2002, vol. 340, no. 1-2, p. 180-188
Abstract Mg6Ir2H11 has been synthesised by both hydrogenation of the intermetallic compound Mg3Ir at 20 bar and ∼300 °C, and sintering of the elements at ∼500 °C under 50 bar hydrogen pressure. Neutron powder diffraction on the deuteride indicates a monoclinic structure (space group P21/c, Mg6Ir2D11: a=10.226(1), b=19.234(2), c=8.3345(9) Å, β=91.00(1)°, T=20 °C) that is closely related to orthorhombic Mg6Co2H11. It contains a square-pyramidal [IrH5]4− complex and three saddle-like [IrH4]5− complexes of which one is ordered and two are disordered. Five hydride anions H− are exclusively bonded to magnesium. The compound has a red colour, is presumably non-metallic and decomposes under 3 bar argon at 500 °C into Mg3Ir, iridium and a previously unreported intermetallic compound of composition Mg5Ir2
Keywords Hydrogen absorbing materialsGas–solid reactionsCrystal structureX-ray diffractionNeutron diffraction
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CERNY, Radovan et al. Mg6Ir2H11, a new metal hydride containing saddle-like [IrH4]5− and square-pyramidal [IrH5]4− hydrido complexes. In: Journal of Alloys and Compounds, 2002, vol. 340, n° 1-2, p. 180-188. https://archive-ouverte.unige.ch/unige:35533

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Deposited on : 2014-04-08

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