oxygen fluoride

{{main article|Oxygen difluoride}}

File:Oxygen-difluoride-3D-vdW.png

A common preparative method involves fluorination of sodium hydroxide:

:{{chem2|2 F2 + 2 NaOH → OF2 + 2 NaF + H2O}}

{{chem2|OF2}} is a colorless gas at room temperature and a yellow liquid below 128 K. Oxygen difluoride has an irritating odor and is poisonous.{{cite journal|author=Streng, A. G.|title=The Oxygen Fluorides|journal=Chemical Reviews|volume=63|issue=6|year=1963|pages=607–624|doi=10.1021/cr60226a003}} It reacts quantitatively with aqueous haloacids to give free halogens:

:{{chem2|OF2 + 4 HCl → 2 Cl2 + 2 HF + 2 H2O}}

It can also displace halogens from their salts. It is both an effective fluorinating agent and a strong oxidizing agent. When reacted with unsaturated nitrogen fluorides with electrical discharge, it results in the formation of nitrogen trifluoride, oxide fluorides and other oxides.{{cite journal|author1=Nikitin, Igor Vasil'evich |author2=V. Ya Rosolovskii |title=Oxygen Fluorides and Dioxygenyl Compounds|journal=Russian Chemical Reviews|volume=40|issue=11|year=1971|pages=889–900|doi=10.1070/rc1971v040n11abeh001981|bibcode=1971RuCRv..40..889N|s2cid=250903149 }}{{cite book |author=Lawless, Edward W. |author2=Ivan C. Smith|title=Inorganic high-energy oxidizers: synthesis, structure, and properties|publisher=M. Dekker|year=1968}}

{{main article|Dioxygen difluoride}}

File:Dioxygen-difluoride-3D-vdW.png

{{chem2|O2F2}} precipitates as a brown solid upon the UV irradiation of a mixture of liquid {{chem2|O2}} and {{chem2|F2}} at −196 °C.{{cite journal |author=Marx, Rupert |author2=Konrad Seppelt|title=Structure investigations on oxygen fluorides|journal=Dalton Transactions|volume=44|issue=45|year=2015|pages=19659–19662|doi=10.1039/c5dt02247a|pmid=26351980}} It also only appears to be stable below −160 °C.Solomon, Irvine J. Research on Chemistry of {{chem2|O3F2}} and {{chem2|O2F2}}. No. IITRI-C227-6. IIT RESEARCH INST CHICAGO IL, 1964. The general method of preparation of many oxygen fluorides is a gas-phase electric discharge in cold containers including {{chem2|O2F2}}.{{cite journal|author=Goetschel, Charles T.|display-authors=etal|title=Low-Temperature Radiation Chemistry. I. Preparation of Oxygen Fluorides and Dioxygenyl Tetrafluoroborate|journal=Journal of the American Chemical Society|volume=91|issue=17|year=1969|pages=4702–4707|doi=10.1021/ja01045a020}}

:{{chem2|O2 + F2 → O2F2}} (electric discharge, 183 °C)

It is typically an orange-yellow solid which rapidly decomposes to {{chem2|O2}} and {{chem2|F2}} close to its normal boiling point of about 216 K.

{{chem2|O2F2}} reacts violently with red phosphorus, even at −196 °C. Explosions can also occur if Freon-13 is used to moderate the reaction.

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{{chem2|O3F2}} is a viscous, blood-red liquid. It remains liquid at 90 K and so can be differentiated from {{chem2|O2F2}} which has a melting point of about 109 K.De Marco, Ronald A., and Jean'ne M. Shreeve . "Fluorinated Peroxides." Advances in Inorganic Chemistry and Radiochemistry. Vol. 16. Academic Press, 1974. 109-176.

Like the other oxygen fluorides, {{chem2|O3F2}} is endothermic and decomposes at about 115 K with the evolution of heat, which is given by the following reaction:

:{{chem2|2 O3F2 → O2 + 2 O2F2}}

{{chem2|O3F2}} is safer to work with than ozone, and can be evaporated, or thermally decomposed, or exposed to electric sparks, without any explosions. But on contact with organic matter or oxidizable compounds, it can detonate or explode. Thus, the addition of even one drop of ozone difluoride to solid anhydrous ammonia will result in a mild explosion, when they are both at 90 K each.

Fluoroperoxyl is a molecule such as O–O–F, whose chemical formula is {{chem2|O2F}} and is stable only at low temperature. It has been reported to be produced from atomic fluorine and dioxygen.J.L.Lyman and R. Holland, J. Phys. Chem.,1988,92, 7232.

:{{chem2|O2 + F → O2F}}

Oxygen- and fluorine-containing radicals like {{chem2|O2F}} and OF occur in the atmosphere. These along with other halogen radicals have been implicated in the destruction of ozone in the atmosphere. However, the oxygen monofluoride radicals are assumed to not play as big a role in the ozone depletion because free fluorine atoms in the atmosphere are believed to react with methane to produce hydrofluoric acid which precipitates in rain. This decreases the availability of free fluorine atoms for oxygen atoms to react with and destroy ozone molecules.{{cite journal | author = Francisco J. S. | year = 1993 | title = An ab initio investigation of the significance of the HOOF intermediate in coupling reactions involving FOO x and HO x species | journal = The Journal of Chemical Physics | volume = 98 | issue = 3| pages = 2198–2207 | doi = 10.1063/1.464199 | bibcode = 1993JChPh..98.2198F }}

:{{chem2|O3 + F → O2 + OF}}

:{{chem2|O + OF → O2 + F}}

Net reaction:

:{{chem2|O3 + O → 2 O2}}

Despite the low solubility of {{chem2|O3F2}} in liquid oxygen, it has been shown to be hypergolic with most rocket propellant fuels. The mechanism involves the boiling off oxygen from the solution containing {{chem2|O3F2}}, making it more reactive to have a spontaneous reaction with the rocket fuel. The degree of reactivity is also dependent on the type of fuel used.

• Bromine oxide
• Chlorine oxide
• Iodine oxide
• Ozone

{{Oxygen compounds}}

{{fluorides}}

Category:Oxygen fluorides