| Dioxygen difluoride | |
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| Other names | dioxygen difluoride fluorine dioxide difluorine dioxide perfluoroperoxide |
| Identifiers | |
| CAS number | [7783-44-0] |
| Properties | |
| Molecular formula | F2O2 |
| Molar mass | 69. CAS registry numbers are unique numerical identifiers for Chemical compounds Polymers biological sequences mixtures and Alloys They are also referred to A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Molar mass, symbol M, is the Mass of one mole of a substance ( Chemical element or Chemical compound) 996 g mol−1 |
| Melting point |
−154 °C |
| Boiling point |
−57 °C (extrapolated) |
| Solubility in other solvents | decomp. The melting point of a solid is the temperature range at which it changes state from solid to Liquid. The boiling point of a liquid is the temperature at which the Vapor pressure of the liquid equals the environmental pressure surrounding the liquid Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. |
| Related compounds | |
| Related compounds | OF2, FClO2 S2Cl2 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Dioxygen difluoride is a compound with the formula O2F2. Oxygen difluoride is the Chemical compound with the formula OF2 Chloryl fluoride is the Chemical compound with the formula ClO2F Disulfur dichloride is the Chemical compound with the formula S2Cl2 In Chemistry, the standard state of a material is its state at 1 bar (100 Kilopascals exactly A chemical compound is a substance consisting of two or more different elements chemically bonded together in a fixed proportion by Mass. A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes This yellow compound is a strong oxidant and decomposes into OF2 and oxygen even at -160 °C (4% per day). [1]
Contents |
Preparation
Dioxygen difluoride can be obtained by subjecting a 1:1 mixture of gaseous fluorine and oxygen at low pressure (7-17 mmgHg is optimal) to an electric discharge of 25-30 mA at 2. The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. The ampere, in practice often shortened to amp, (symbol A is a unit of Electric current, or amount of Electric charge per second 1-2. 4 kV. The volt (symbol V) is the SI derived unit of electric Potential difference or Electromotive force. This is basically the reaction used for the first synthesis by Otto Ruff in 1933. Otto Ruff ( December 12, 1871 - September 17, 1939) was a German Chemist. [2]Another synthesis involves mixing O2 and F2 in a stainless steel vessel cooled to −196 °C, followed by exposing the elements to 3 MeV bremsstrahlung for several hours. In Metallurgy, stainless steel is defined as a Steel Alloy with a minimum of 11 Bremsstrahlung ( pronounced, from German de ''bremsen'' "to brake" and de ''Strahlung'' "radiation" i
Structure and electronic description
In O2F2 oxygen is assigned the unusual oxidation state of +1. In Chemistry, the oxidation state is an indicator of the degree of Oxidation of an Atom in a Chemical compound. In most of its other compounds, oxygen has an oxidation state of −2.
The structure of dioxygen difluoride resembles that of hydrogen peroxide, H2O2, in its large dihedral angle, which approaches 90°. Hydrogen peroxide (H2O2 is a very pale blue liquid which appears colorless in a dilute solution slightly more Viscous than water In Aerospace engineering, the Dihedral is the Angle between the two wings see Dihedral. This geometry conforms with the predictions of VSEPR theory. Valence shell electron pair repulsion (VSEPR theory (1957 is a model in Chemistry, which is used for predicting the shapes of individual Molecules based The O−O bond length is within 2 pm of the 120. 7 pm distance for the O=O double bond in dioxygen, O2. To help compare different Orders of magnitude this page lists Lengths between 10&minus12 m and 10&minus11 m (1 pm and 10 pm Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the
The bonding within dioxygen difluoride has been the subject of considerable speculation over the years, particularly because of the very short O-O distance and the long O-F distances. Bridgeman has proposed a scheme which essentially has an O-O triple bond and an O-F single bond that is destabilised and lengthened by repulsion between the lone pairs on the fluorine atoms and the π-orbitals of the O-O bond. lone pair is a (valence electron pair without bonding or sharing with other Atoms They are found in the outermost Electron shell of an atom so lone pairs In Chemistry, pi bonds ( π bonds) are covalent Chemical bonds where two lobes of one involved electron orbital overlap two lobes [3] Repulsion involving the fluorine lone pairs is also responsible for the long and weak covalent bonding in the fluorine molecule. The covalent radius of fluorine is a measure of the size of a Fluorine Atom, which is approximated at about 60 pm
Reactivity
The overarching property of this unstable compound is its oxidizing power, despite the fact that all reactions must be conducted near −100 °C. [4] With BF3 and PF5, it gives the corresponding dioxygenyl salts:[1]
- 2O2F2 + 2PF5 → 2[O2+]PF6− + F2
It converts uranium and plutonium oxides into the corresponding hexafluorides. Boron trifluoride is the Chemical compound with the formula BF3 Phosphorus pentafluoride, P[[fluorine F5]] is a phosphorus halide. The dioxygenyl Ion, O2+ is a rarely-encountered Oxycation in which both Oxygen Atoms have an Oxidation state Hexafluorophosphate is an anion with chemical formula of − As a Non-coordinating anion, it is a poor Nucleophile. [5]
References
- ^ a b Holleman, A. F. ; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
- ^ Otto Ruff, W. Otto Ruff ( December 12, 1871 - September 17, 1939) was a German Chemist. Menzel (1933)). "Neue Sauerstofffluoride: O2F2 und OF". Zeitschrift für anorganische und allgemeine Chemie 211 (1-2): 204–208. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
- ^ Bridgeman, A. J. , Rothery, J. "Bonding in mixed halogen and hydrogen peroxides" Journal of the Chemical Society, Dalton Transactions, 1999, 4077-4082. DOI:10. 1039/a904968a
- ^ Streng, A. G. "The Chemical Properties of Dioxygen Difluoride" Journal of the American Chemical Society 85 (10), 1380 - 1385. DOI:10. 1021/ja00893a004
- ^ Atwood, D. A. "Fluorine: Inorganic Chemistry" in Encyclopedia of Inorganic Chemistry 2006 John Wiley & Sons, New York. DOI:10. 1002/0470862106. ia076
External links
Dictionary
dioxygen difluoride
-noun
- (inorganic chemistry) The binary compound of oxygen and fluorine O2F2; it is explosive.
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