Rhenium pentafluoride

Rhenium pentafluoride is a binary inorganic compound of rhenium and fluorine with the chemical formula ReF₅.^[1] This is a salt of rhenium and hydrofluoric acid.^[2]

Rhenium pentafluoride

Names
Other names Rhenium(V) fluoride
Identifiers
CAS Number	30937-52-1
3D model (JSmol)	Interactive image
PubChem CID	15796911
InChI InChI=1S/5FH.Re/h5*1H;/q;;;;;+5/p-5 Key: UKUWGTWCIFEMQK-UHFFFAOYSA-I
SMILES F[Re](F)(F)(F)F
Properties
Chemical formula	F5Re
Molar mass	281.199 g·mol−1
Appearance	yellow-green crystals
Density	g/cm3
Melting point	48 °C (118 °F; 321 K)
Boiling point	221.3 °C (430.3 °F; 494.4 K)
Solubility in water	reacts with water
Structure
Crystal structure	orthorhombic
Related compounds
Related compounds	Osmium pentafluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Rhenium pentafluoride can be synthesised by the reduction of rhenium hexafluoride with hydrogen, rhenium, or tungsten:

2ReF₆ + H₂ → 2ReF₅ + 2HF

5ReF₆ + Re → 6ReF₅

6ReF₆ + W → 6ReF₅ + WF₆

Physical properties

Rhenium pentafluoride forms yellow-green crystals^[3] of orthorhombic crystal system, cell parameters a = 0.57 nm, b = 1.723 nm, c = 0.767 nm.

Rhenium pentafluoride reacts with water.

Rhenium pentafluoride is volatile. The compound consists of dimers of composition Re₂F₁₀.