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Abstract
Raman and Infrared spectra of Lithium and Sodium hexahydrio- and hexadeuteridoaluminates Li 3AlH 6, Na 3AlH 6 and Li 3AlD 6 have been investigated in order to study metal-hydrogen interactions. A vibrational analysis has been performed. Several force field models (Urey-Bradley, Orbital Valence force field, Shimanouchi, Murrell).have been used in order to compute the force constants of Al-H bonds. No significative difference has been observed between the results obtained from the various models, and the environnement of aluminum has been thus well determined : AlH 6 3− ions form an almost perfect octahedron in Li 3AlH 6 and a distorted one in Na 3AlH 6.
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