RBsumB. L'auteur a pu obtenir les frequences des vibrations actives en diffusion Raman du chlorure de magnesium hexa-ammine hydrogen6 et deuterie B I'etat cristallise. Toutes les vibrations attendues ont pu dtre observees pour la premiere fois pour un compose de ce type (vibrations internes et vibrations externes). L'attribution de toutes les bandes du spectre est proposee. Ces resultats, rapproches de ceux obtenus par spectroscopie infrarouge, permettent de connaitre la structure vibrationnelle complete du complexe. L'eclatement de certaines vibrations montre que les coordinats ne sont pas en rotation libre et que leur orientation donne a I'ion complexe la symetrie du groupe ponctuel D3d.Summary. The frequencies of Raman active vibrations of Mg(NH3)&12 and Mg(ND3)&12 in the solid state were obtained. For the first time, all vibrations predicted by group theory (internal and external vibrations) were observed for a compound of this type. The bands have been assigned.These results and those obtained using infrared spectroscopy gave a complete vibrational analysis. The splitting of certain degenerate vibrations shows that the ligands are not in free rotation and that their orientation gives the complex ion a D3d point group symmetry.
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