Molybdenum hexafluoride

Molybdenum hexafluoride

Colorless to yellowish liquid

Liquid

• 3.50 g · cm -3 ( -140 ° C)
• 2.54 g · cm -3 ( 19 ° C)

17.5 ° C

34.0 ° C

Reacts with water

Risk

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Molybdenum (VI ) fluoride ( MoF6 ), often also molybdenum hexafluoride, is a chemical compound of the elements molybdenum and fluorine and belongs to the group of hexafluoride. It is the highest fluoride of molybdenum. Since molybdenum is a cleavage product of the uranium hexafluoride, molybdenum acts as Verunreiningung of uranium hexafluoride. Furthermore, it is included because of the chemical similarity of molybdenum and tungsten and as an impurity in tungsten hexafluoride. It is from this by reduction of WF6 - MoF6 mixture with any item, including molybdenum, are removed at a moderately elevated temperature.

Representation

Molybdenum hexafluoride is shown by the direct reaction of the metal in an excess of elemental fluorine (F2).

Properties

Molybdenum hexafluoride is a liquid which solidifies to a white crystalline solid at 17.5 ° C and boiling at 34.0 ° 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 = 939.4 pm, b = 854.3 pm and c = 495.9 pm and four formula units per unit cell with a calculated density of 3.50 g · cm -3. The fluorine atoms take on the Hexagonal a densest sphere packing. The MoF6 molecule is octahedral ( Oh); the Mo -F bond length is 181.7 pm.