Rhenium tetrafluoride

Rhenium tetrafluoride is a binary inorganic compound of rhenium and fluorine with the chemical formula ReF4.

Synthesis
Rhenium tetrafluoride can be made by the reduction of rhenium hexafluoride with hydrogen, rhenium, or sulfur dioxide:
 * ReF6 + H2 -> 2ReF4 + 2HF


 * 2ReF6 + Re -> 3ReF4


 * ReF6 + SO2 -> ReF4 + SO2F2

Physical properties
Rhenium tetrafluoride forms blue crystals of tetragonal structure, cell parameters a = 1.012 nm, c = 1.595 nm.

Rhenium tetrafluoride reacts with water, and corrodes glass when heated.