Oxygen difluoride

Oxygen difluoride
Structure and dimensions of the oxygen difluoride molecule
Space-filling model of the oxygen difluoride molecule
Names
IUPAC name
Oxygen difluoride
Other names
  • Oxygen fluoride
  • Hypofluorous anhydride
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.029.087 Edit this at Wikidata
EC Number
  • 231-996-7
RTECS number
  • RS2100000
UNII
  • InChI=1S/F2O/c1-3-2 checkY
    Key: UJMWVICAENGCRF-UHFFFAOYSA-N checkY
  • InChI=1/F2O/c1-3-2
    Key: UJMWVICAENGCRF-UHFFFAOYAI
  • FOF
Properties
OF2
Molar mass 53.9962 g/mol
Appearance colorless gas, pale yellow liquid when condensed
Odor peculiar, foul
Density
  • 1.90 g/cm3 (−224 °C, liquid)
  • 1.719 g/cm3 (−183 °C, liquid)
  • 1.521 g/cm3 (liquid at −145 °C)
  • 1.88 g/L (gas at room temperature)
Melting point −223.8 °C (−370.8 °F; 49.3 K)
Boiling point −144.75 °C (−228.55 °F; 128.40 K)
hydrolyzes[1] slowly
Vapor pressure 48.9 atm (at −58.0 °C or −72.4 °F or 215.2 K[a])
Thermochemistry
43.3 J/mol K
246.98 J/mol K
−24.5 kJ mol−1
42.5 kJ/mol
Hazards
GHS labelling:[4]
GHS03: OxidizingGHS05: CorrosiveGHS06: Toxic
Danger
H270, H314, H330
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 3: Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked. E.g. hydrogen peroxideSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
4
0
3
OX
Lethal dose or concentration (LD, LC):
  • 2.6 ppm (rat, 1 hour)
  • 1.5 ppm (mouse, 1 hour)
  • 26 ppm (dog, 1 hour)
  • 16 ppm (monkey, 1 hour)
[3]
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 0.05 ppm (0.1 mg/m3)[2]
REL (Recommended)
 C 0.05 ppm (0.1 mg/m3)[2]
IDLH (Immediate danger)
 0.5 ppm[2]
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Oxygen difluoride is a chemical compound with the formula OF2. As predicted by VSEPR theory, the molecule adopts a bent molecular geometry. It is a strong oxidizer and has attracted attention in rocketry for this reason.[5] With a boiling point of −144.75 °C, OF2 is the most volatile (isolable) triatomic compound.[6] The compound is one of many known oxygen fluorides.

  1. ^ "difluorine monoxide; oxygen difluoride, physical properties, suppliers, CAS, MSDS, structure, Molecular Formula, Molecular Weight, Solubility, boiling point, melting point". www.chemyq.com.
  2. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0475". National Institute for Occupational Safety and Health (NIOSH).
  3. ^ "Oxygen difluoride". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  4. ^ GHS: GESTIS 570242
  5. ^ "Oxygen Difluoride - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 2023-11-03.
  6. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 819. ISBN 978-0-08-037941-8.


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