With THF. The same synthesis procedure was used as
described in section a, except for the solvent, which was
THF in this case. The product was a dry white, voluminous
powder. Soxhlet extraction with THF as solvent was applied
to separate the tetrahydroaluminate from the byproduct NaCl.
Due to the good solubility of the THF adduct obtained,
however, it is also possible to digest the raw product with
warm THF and separate the dissolved tetrahydroaluminate
by filtering. The solvent was removed using the drying
procedure described in section 3.1.2. After drying, the yield
was 70%, relating to Ca(AlH4)2.
The results of the XRF analysis revealed that the dried
and oxidized product contained 17.1% Ca, 34.6% Al, 4.5%
Cl, 4.9% Na, and 0.3% Si. Calculation was based on an
oxidic matrix. The Al:Ca ratio was 2.03.
With THF. The same synthesis procedure was used asdescribed in section a, except for the solvent, which wasTHF in this case. The product was a dry white, voluminouspowder. Soxhlet extraction with THF as solvent was appliedto separate the tetrahydroaluminate from the byproduct NaCl.Due to the good solubility of the THF adduct obtained,however, it is also possible to digest the raw product withwarm THF and separate the dissolved tetrahydroaluminateby filtering. The solvent was removed using the dryingprocedure described in section 3.1.2. After drying, the yieldwas 70%, relating to Ca(AlH4)2.The results of the XRF analysis revealed that the driedand oxidized product contained 17.1% Ca, 34.6% Al, 4.5%Cl, 4.9% Na, and 0.3% Si. Calculation was based on anoxidic matrix. The Al:Ca ratio was 2.03.
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