MOLYBDENUM HEXAFLUORIDE Property

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

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

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

H318Causes serious eye damage

H330Fatal if inhaled

Precautionary statements

P280Wear protective gloves/protective clothing/eye protection/face protection.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P309IF exposed or if you feel unwell:

P310Immediately call a POISON CENTER or doctor/physician.

P402+P404Store in a dry place. Store in a closed container.

MOLYBDENUM HEXAFLUORIDE Chemical Properties,Usage,Production

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.