Rhenium hexafluoride

Rhenium

Yellow crystalline solid

Liquid

4.94 g · cm -3 ( -140 ° C)

18.5 ° C

33.7 ° C

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Rhenium (VI ) fluoride ( ReF6 ), usually also rhenium, ( ReF6 ) is a chemical compound of the elements rhenium and fluorine and belongs to the group of hexafluoride.

Representation

Rhenium is prepared by reaction of rhenium (VII ) fluoride REF7 with rhenium in an autoclave at 300 ° C.

Also possible is the representation of the elements.

Properties

Rhenium is a liquid that solidifies into a yellow crystalline solid at 18.5 ° C and boiling at 33.7 ° C at room temperature. It crystallizes in the orthorhombic crystal system (measured at -140 ° C) in the space group Pnma with the lattice parameters a = 941.7 pm, b = 857.0 pm and c = 496.5 pm and four formula units per unit cell with a calculated density of 4.94 g · cm -3. The ReF6 molecule is octahedral ( Oh); the Re -F bond length is 182.3 pm.