High Quality Content by WIKIPEDIA articles! Rhenium heptafluoride is the compound with the formula ReF7. It is a yellow low melting solid, and is the only thermally stable metal heptafluoride. It has a distorted pentagonal bipyramidal structure similar to IF7, which was confirmed by neutron diffraction at 1.5K. The structure is non-rigid as evidenced by electron diffraction studies. It can be prepared from the elements at 400°C.[4] With fluoride donors such as CsF, the ReF8? anion is formed, which has a square antiprismatic structure. With antimony pentafluoride, SbF5, a fluoride acceptor, the ReF6+ cation is formed. In geometry, the pentagonal bipyramid (or dipyramid) is third of the infinite set of face-transitive bipyramids. The set of bipyramids is the dual of the uniform prisms. It is also a Johnson solid (J13), constructed of regular polygons. It can be seen as two pentagonal pyramids (J2) connected along their bases.

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