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Rhenium heptafluoride

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 1.5 K. The structure is non-rigid, as evidenced by electron diffraction studies.

Production, reactions and properties
Rhenium heptafluoride can be prepared from the elements at 400 °C: :2 Re + 7 F2 → 2 ReF7 It also can be produced by the explosion of rhenium metal under sulfur hexafluoride. It hydrolyzes under a base to form perrhenic acid and hydrogen fluoride: With antimony pentafluoride, SbF5, a fluoride acceptor, the cation is formed. ==References==
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