Synthesis of a stable adduct of dialane(4) (Al2H4) via hydrogenation of a magnesium(I) dimer

Simon J. Bonyhady; David Collis; Gernot Frenking; Nicole Holzmann; Cameron Jones; Andreas Stasch

doi:10.1038/nchem.762

Synthesis of a stable adduct of dialane(4) (Al₂H₄) via hydrogenation of a magnesium(I) dimer

Simon J. Bonyhady, David Collis, Gernot Frenking, Nicole Holzmann, Cameron Jones, Andreas Stasch

Research output: Contribution to journal › Article › peer-review

217 Scopus citations

Abstract

The desorption of dihydrogen from magnesium(II) hydride, MgH₂ (containing 7.6 wt% H), is reversible. MgH₂ therefore holds promise as a hydrogen storage material in devices powered by fuel cells. We believed that dimeric magnesium(I) dimers (LMgMgL, L =β-diketiminate) could find use as soluble models to aid the study of the mechanisms and/or kinetics of the hydrogenation of magnesium and its alloys. Here, we show that LMgMgL can be readily hydrogenated to yield LMg(μ-H)₂ MgL by treatment with aluminium(III) hydride complexes. In one case, hydrogenation was reversed by treating LMg(μ-H)₂ MgL with potassium metal. The hydrogenation by-products are the first thermally stable, neutral aluminium(II) hydride complexes to be produced, one of which, [{(IPr)(H)₂ Al}₂] (IPr =:C[{(C₆H₃-i-Pr₂-2,6)NCH}₂]), is an N-heterocyclic carbene adduct of the elusive parent dialane(4) (Al ₂H₄). A computational analysis of this compound is presented.

Original language	English
Pages (from-to)	865-869
Number of pages	5
Journal	Nature Chemistry
Volume	2
Issue number	10
DOIs	https://doi.org/10.1038/nchem.762
State	Published - Oct 2010
Externally published	Yes

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title = "Synthesis of a stable adduct of dialane(4) (Al2H4) via hydrogenation of a magnesium(I) dimer",

abstract = "The desorption of dihydrogen from magnesium(II) hydride, MgH2 (containing 7.6 wt% H), is reversible. MgH2 therefore holds promise as a hydrogen storage material in devices powered by fuel cells. We believed that dimeric magnesium(I) dimers (LMgMgL, L =β-diketiminate) could find use as soluble models to aid the study of the mechanisms and/or kinetics of the hydrogenation of magnesium and its alloys. Here, we show that LMgMgL can be readily hydrogenated to yield LMg(μ-H)2 MgL by treatment with aluminium(III) hydride complexes. In one case, hydrogenation was reversed by treating LMg(μ-H)2 MgL with potassium metal. The hydrogenation by-products are the first thermally stable, neutral aluminium(II) hydride complexes to be produced, one of which, [{(IPr)(H)2 Al}2] (IPr =:C[{(C6H3-i-Pr2-2,6)NCH}2]), is an N-heterocyclic carbene adduct of the elusive parent dialane(4) (Al 2H4). A computational analysis of this compound is presented.",

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T1 - Synthesis of a stable adduct of dialane(4) (Al2H4) via hydrogenation of a magnesium(I) dimer

AU - Bonyhady, Simon J.

AU - Collis, David

AU - Frenking, Gernot

AU - Holzmann, Nicole

AU - Jones, Cameron

AU - Stasch, Andreas

PY - 2010/10

Y1 - 2010/10

N2 - The desorption of dihydrogen from magnesium(II) hydride, MgH2 (containing 7.6 wt% H), is reversible. MgH2 therefore holds promise as a hydrogen storage material in devices powered by fuel cells. We believed that dimeric magnesium(I) dimers (LMgMgL, L =β-diketiminate) could find use as soluble models to aid the study of the mechanisms and/or kinetics of the hydrogenation of magnesium and its alloys. Here, we show that LMgMgL can be readily hydrogenated to yield LMg(μ-H)2 MgL by treatment with aluminium(III) hydride complexes. In one case, hydrogenation was reversed by treating LMg(μ-H)2 MgL with potassium metal. The hydrogenation by-products are the first thermally stable, neutral aluminium(II) hydride complexes to be produced, one of which, [{(IPr)(H)2 Al}2] (IPr =:C[{(C6H3-i-Pr2-2,6)NCH}2]), is an N-heterocyclic carbene adduct of the elusive parent dialane(4) (Al 2H4). A computational analysis of this compound is presented.

AB - The desorption of dihydrogen from magnesium(II) hydride, MgH2 (containing 7.6 wt% H), is reversible. MgH2 therefore holds promise as a hydrogen storage material in devices powered by fuel cells. We believed that dimeric magnesium(I) dimers (LMgMgL, L =β-diketiminate) could find use as soluble models to aid the study of the mechanisms and/or kinetics of the hydrogenation of magnesium and its alloys. Here, we show that LMgMgL can be readily hydrogenated to yield LMg(μ-H)2 MgL by treatment with aluminium(III) hydride complexes. In one case, hydrogenation was reversed by treating LMg(μ-H)2 MgL with potassium metal. The hydrogenation by-products are the first thermally stable, neutral aluminium(II) hydride complexes to be produced, one of which, [{(IPr)(H)2 Al}2] (IPr =:C[{(C6H3-i-Pr2-2,6)NCH}2]), is an N-heterocyclic carbene adduct of the elusive parent dialane(4) (Al 2H4). A computational analysis of this compound is presented.

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Synthesis of a stable adduct of dialane(4) (Al₂H₄) via hydrogenation of a magnesium(I) dimer

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