MOLYBDENUM HEXAFLUORIDE

CAS NO.：7783-77-9
Empirical Formula: F6Mo
Molecular Weight: 209.93
MDL number: MFCD00014220
EINECS: 232-026-5
SAFETY DATA SHEET (SDS)
Update Date: 2025-07-04 15:17:32

What is MOLYBDENUM HEXAFLUORIDE?

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).

The Uses of MOLYBDENUM HEXAFLUORIDE

Separation of molybdenum isotopes.

The Uses of MOLYBDENUM HEXAFLUORIDE

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

Preparation

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

Definition

ChEBI: Molybdenum hexafluoride is a molybdenum halide.

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.

Properties of MOLYBDENUM HEXAFLUORIDE

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]
Sensitive	Hygroscopic
Crystal Structure	Cubic
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 for MOLYBDENUM HEXAFLUORIDE

Signal word	Danger
Pictogram(s)	Corrosion Corrosives GHS05 Skull and Crossbones Acute Toxicity GHS06
GHS Hazard Statements	H314:Skin corrosion/irritation H318:Serious eye damage/eye irritation H330:Acute toxicity,inhalation
Precautionary Statement Codes	P280:Wear protective gloves/protective clothing/eye protection/face protection. P309:IF exposed or if you feel unwell: P310:Immediately call a POISON CENTER or doctor/physician. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P402+P404:Store in a dry place. Store in a closed container.