Synthesis, Crystal Structures,
and Hydrogen-Storage
Properties of Eu(AlH<sub>4</sub>)<sub>2</sub> and Sr(AlH<sub>4</sub>)<sub>2</sub> and of Their Decomposition Intermediates, EuAlH<sub>5</sub> and SrAlH<sub>5</sub>
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Abstract
Complex Eu(AlH<sub>4</sub>)<sub>2</sub> and Sr(AlH<sub>4</sub>)<sub>2</sub> hydrides have been prepared by a mechanochemical
metathesis
reaction from NaAlH<sub>4</sub> and europium or strontium chlorides.
The crystal structures were solved from powder X-ray diffraction data
in combination with solid-state <sup>27</sup>Al NMR spectroscopy.
The thermolysis pathway was analyzed in detail, allowing identification
of new intermediate EuAlH<sub>5</sub>/SrAlH<sub>5</sub> compounds.
Rehydrogenation experiments indicate that the second decomposition
step is reversible
