Oxygen difluoride

Oxygen difluoride
Names
	IUPAC name Oxygen difluoride
	Other names Oxygen fluoride; Hypofluorous anhydride;
Identifiers
CAS Number	7783-41-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30494 ;
ChemSpider	22953 ;
ECHA InfoCard	100.029.087
EC Number	231-996-7;
PubChem CID	24547;
RTECS number	RS2100000;
UNII	7BCS2CW398 ;
CompTox Dashboard (EPA)	DTXSID20894009 ;
	InChI InChI=1S/F2O/c1-3-2 Key: UJMWVICAENGCRF-UHFFFAOYSA-N ; InChI=1/F2O/c1-3-2 Key: UJMWVICAENGCRF-UHFFFAOYAI;
	SMILES FOF;
Properties
Chemical formula	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)
Solubility in water	hydrolyzes slowly
Vapor pressure	48.9 atm (at −58.0 °C or −72.4 °F or 215.2 K)
Structure
Point group	C2V
Thermochemistry
Heat capacity (C)	43.3 J/mol K
Std molar; entropy (S⦵298)	247.46 J/mol K
Std enthalpy of; formation (ΔfH⦵298)	24.5 kJ mol−1
Gibbs free energy (ΔfG⦵)	41.8 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H270, H314, H330
NFPA 704 (fire diamond)	4 0 3 OX
	Lethal dose or concentration (LD, LC):
LC50 (median concentration)	2.6 ppm (rat, 1 hour); 1.5 ppm (mouse, 1 hour); 26 ppm (dog, 1 hour); 16 ppm (monkey, 1 hour);
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.05 ppm (0.1 mg/m3)
REL (Recommended)	C 0.05 ppm (0.1 mg/m3)
IDLH (Immediate danger)	0.5 ppm
Related compounds
Related compounds	HFO; O2F2; NHF2; NF3; SCl2; H2O; Cl2O; Br2O; I2O;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

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. With a boiling point of −144.75 °C, OF₂ is the most volatile (isolable) triatomic compound. The compound is one of many known oxygen fluorides.

Names


IUPAC name Oxygen difluoride
Other names Oxygen fluoride Hypofluorous anhydride
Identifiers
CAS Number	7783-41-7^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:30494^Y
ChemSpider	22953^Y
ECHA InfoCard	100.029.087
EC Number	231-996-7
PubChem CID	24547
RTECS number	RS2100000
UNII	7BCS2CW398^Y
CompTox Dashboard (EPA)	DTXSID20894009
InChI InChI=1S/F2O/c1-3-2^Y Key: UJMWVICAENGCRF-UHFFFAOYSA-N^Y InChI=1/F2O/c1-3-2 Key: UJMWVICAENGCRF-UHFFFAOYAI
SMILES FOF
Properties
Chemical formula	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)
Solubility in water	hydrolyzes slowly
Vapor pressure	48.9 atm (at −58.0 °C or −72.4 °F or 215.2 K)
Structure
Point group	C_2V
Thermochemistry
Heat capacity (C)	43.3 J/mol K
Std molar entropy (S^⦵₂₉₈)	247.46 J/mol K
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	24.5 kJ mol⁻¹
Gibbs free energy (Δ_fG^⦵)	41.8 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H270, H314, H330
NFPA 704 (fire diamond)	4 0 3 OX
Lethal dose or concentration (LD, LC):
LC₅₀ (median concentration)	2.6 ppm (rat, 1 hour) 1.5 ppm (mouse, 1 hour) 26 ppm (dog, 1 hour) 16 ppm (monkey, 1 hour)
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.05 ppm (0.1 mg/m³)
REL (Recommended)	C 0.05 ppm (0.1 mg/m³)
IDLH (Immediate danger)	0.5 ppm
Related compounds
Related compounds	HFO O₂F₂ NHF₂ NF₃ SCl₂ H₂O Cl₂O Br₂O I₂O
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is ^YN ?) Infobox references