In this case, the formation of Al should be detectable, for example, by
a gray coloring of the sample and Al signals in the X-ray pattern, which, however, were not observed. Both the single-crystal data of Ca(AlH4)2•4THF and the powder X-ray data of Ca(AlH4)2 show a material with a high disorder in the lattice, which is not observed with the lighter and heavier homologues of the tetrahydroaluminate. As the crystalline THF adduct decomposes into an ultrafine powder upon drying, the structure is not accessible by single-crystal
methods.
In this case, the formation of Al should be detectable, for example, by a gray coloring of the sample and Al signals in the X-ray pattern, which, however, were not observed. Both the single-crystal data of Ca(AlH4)2•4THF and the powder X-ray data of Ca(AlH4)2 show a material with a high disorder in the lattice, which is not observed with the lighter and heavier homologues of the tetrahydroaluminate. As the crystalline THF adduct decomposes into an ultrafine powder upon drying, the structure is not accessible by single-crystalmethods.
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