MOLYBDENUM HEXAFLUORIDE Chemical Properties

Melting point:

17.5 °C(lit.)

Boiling point:

37 °C(lit.)

Density 

2.3 g/mL at 25 °C(lit.)

Flash point:

35°CC

solubility 

Miscible with saturated hydrocarbons, chlorinated and fluorinated hydrocarbons.

form 

Liquid

color 

Colorless

Water Solubility 

hydrolyzed in H2O; soluble anhydrous HF: 1.5 moles/1000g HF [MER06]

Crystal Structure

Cubic

Sensitive 

Hygroscopic

Merck 

14,6237

Exposure limits

ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3

CAS DataBase Reference

7783-77-9(CAS DataBase Reference)

EPA Substance Registry System

Molybdenum fluoride (MoF6), (OC-6-11)- (7783-77-9)

Safety Information

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

26-36/37/39-45

RIDADR 

UN 3264 8/PG 2

WGK Germany 

3

RTECS 

QA4681450

F 

10-21

Hazard Note 

Corrosive

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

II

HS Code 

28261990

MSDS

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MOLYBDENUM HEXAFLUORIDE Usage And Synthesis

Chemical Properties

liquid

Physical properties

White cubic crystals or colorless volatile liquid; hygroscopic; density 2.54 g/cm³; melts at 17.5°C; boils at 34°C; critical temperature 200°C; critical pressure 46.88 atm; critical volume 226 cm3/mol; reacts with water (hydrolyzed).

Uses

Molybdenum(VI) fluoride plays an important role in the semiconductor industry and the nuclear industry.

Uses

Separation of molybdenum isotopes.

Definition

ChEBI: Molybdenum hexafluoride is a molybdenum halide.

Preparation

Molybdenum hexafluoride is prepared by passing fluorine over molybdenum powder:
Mo + 3F₂ → MoF₆.

Hazard

Strong irritant.

Purification Methods

Purify the hexafluoride by low-temperature trap-to-trap distillation over pre-dried NaF. It is hygroscopic, fumes in moist air and is hydrolysed readily by H2O. [Oppengard et al. J Am Chem Soc 82 3825 1960, Anderson & Winfield J Chem Soc, Dalton Trans 337 1986, Kwasnik in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 259 1963.] Poisonous vapours.

MOLYBDENUM HEXAFLUORIDE(7783-77-9)Related Product Information

• MOLYBDENUM(V) CHLORIDE
• Sulfur tetrafluoride
• Iodine pentafluoride
• MOLYBDENUM HEXAFLUORIDE
• Molybdenum