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

Article Article scientifique Article Mg6Ir2H11, a new metal hydride containing saddle-like [IrH4]5− and square-pyramidal [IrH5]4− hydrido complexes eng 2002 author Cerny Radovan 28214 author Joubert Jean-Marc Eric 105326 author Kohlmann Holger 503864 author Yvon Klaus 25146 180-188 10.1016/S0925-8388(02)00050-6 0925-8388 http://linkinghub.elsevier.com/retrieve/pii/S0925838802000506 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 Hydrogen absorbing materials Gas–solid reactions Crystal structure X-ray diffraction Neutron diffraction Dewey 500.2 33 Département de physique de la matière quantique 131 false 806 Groupe Cerny Journal of alloys and compounds 340 1-2 2f9f7f99-b969-488a-b90b-310d8ccaf4d9 Article (Published version) Restricted Cerny83.pdf 533937 application/pdf restrictedAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Mg₆Ir₂H₁₁, a new metal hydride containing saddle-like [IrH₄]⁵⁻ and square-pyramidal [IrH₅]⁴⁻ hydrido complexes	Journal of alloys and compounds	2002	594	0
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