Abstract
Abstract The black rubidium oxide Rb 4 O 6 has been described to be a mixed peroxide-hyperoxide Rb 4 (O 2 2− )(O 2 − ) 2 in the literature. Previous X-ray diffraction studies on powders and single crystals, however, revealed that Rb 4 O 6 crystallises like cubic Pu 2 C 3 (space group I3d), and has only one crystallographically independent position for a dumbbell-shaped molecular ion. Elastic neutron scattering now shows that this structure is stable down to 5 K, and no reduction of symmetry nor ordering of the differently sized yet indistinguishable dioxygen anions takes place. The presence of the peroxide and hyperoxide anions in Rb 4 O 6 at 4 K is proved by inelastic neutron scattering, resulting in two absorptions at 750 cm −1 and 1130 cm −1 , which correspond to the stretching vibrations of O 2 − and O 2 − .
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