Synthesis, Crystal Structures, and Hydrogen-Storage Properties of Eu(AlH4)2 and Sr(AlH4)2 and of Their Decomposition Intermediates, EuAlH5 and SrAlH5

摘要

Complex Eu(AlH4)2 and Sr(AlH4)2 hydrides have been prepared by anmechanochemical metathesis reaction from NaAlH4 and europium or strontiumnchlorides. The crystal structures were solved from powder X-ray diffraction data inncombination with solid-state 27Al NMR spectroscopy. The thermolysis pathway wasnanalyzed in detail, allowing identification of new intermediate EuAlH5/SrAlH5ncompounds. Rehydrogenation experiments indicate that the second decompositionnstep is reversible