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Names | |
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IUPAC name trifluoro(oxo)-λ5-chlorane | |
Other names Chlorosyl trifluoride | |
Identifiers | |
3D model (JSmol) | |
PubChem CID | |
CompTox Dashboard (EPA) | |
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Properties | |
ClOF3 | |
Molar mass | 108.44 g·mol−1 |
Appearance | Colorless liquid |
Density | 1.865 g/cm3 |
Melting point | −42 °C (−44 °F; 231 K) |
Boiling point | 29 °C (84 °F; 302 K) |
Structure | |
monoclinic | |
C2/m | |
a = 9.826, b = 12.295, c = 4.901 | |
Lattice volume (V) | 592.1 |
Formula units (Z) | 8 |
Hazards | |
GHS labelling: | |
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Danger | |
Related compounds | |
Related compounds | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Chlorine oxide trifluoride or chlorine trifluoride oxide is a corrosive colorless liquid molecular compound with formula Cl O F 3. It was developed secretly as a rocket fuel oxidiser.
Chlorine oxide trifluoride was originally made at Rocketdyne [3] by treating dichlorine monoxide with fluorine. Other substances that could react with fluorine to make it includes sodium chlorite NaClO2, and chlorine nitrate Cl−O−NO2. The first published production method was a reaction of dichlorine monoxide with oxygen difluoride OF2. Yet other production methods are reactions between ClO2F or ClO3F and chlorine fluorides. [4] A safer approach is the use chlorine nitrate with fluorine.
As a Lewis base it can lose a fluoride ion to Lewis acids, yielding the difluorooxochloronium(V) cation [ClOF2]+. [5] Compounds with this include: [ClOF2]+[BF4]−, [ClOF2]+[PF6]−, [ClOF2]+[AsF6]−, [ClOF2]+[SbF6]−, [ClOF2]+[BiF6]−, [ClOF2]+[VF6]−, [ClOF2]+[NbF6]−, [ClOF2]+[TaF6]−, [ClOF2]+[UF6]−, ([ClOF2]+)2[SiF6]2−, [ClOF2]+[MoOF5]−, [ClOF2]+[Mo2O4F9]−, [4] [ClOF2]+[PtF6]. [6]
Functioning as a Lewis acid, it can gain a fluoride ion from a strong base to yield a tetrafluorooxochlorate(V) anion ClOF−4. [7] These include K+[ClOF4]− (potassium tetrafluorooxochlorate(V)), Rb+[ClOF4]− (rubidium tetrafluorooxochlorate(V)), and Cs+[ClOF4]− (caesium tetrafluorooxochlorate(V)). These three salts are white crystalline solids. [4] [8] This allows purification of ClOF3, as at room temperature a solid complex is formed, but this decomposes between 50 and 70 °C. Other likely impurities either will not react with alkali fluoride, or if they do will not easily decompose. [3]
Chlorine trifluoride oxide fluoridates various materials such as chlorine monoxide, chlorine, glass or quartz. [3]
Chlorine trifluoride oxide adds to chlorine fluorosulfate:
The reaction also produces SO2F2. [3]
Chlorine trifluoride oxide can fluoridate and add oxygen in the same reaction, reacting with molybdenum pentafluoride, silicon tetrafluoride, tetrafluorohydrazine (over 100 °C), HNF2, and F2NCOF. From HNF2 the main result was NF3O. From MoF5, the results were MoF6 and MoOF4. [3]
It reacts explosively with hydrocarbons. [3] With small amounts of water, ClO2F is formed along with HF. [3]
Over 280 °C ClOF3 decomposes to oxygen and chlorine trifluoride. [3]
The boiling point of chlorine trifluoride oxide is 29 °C. [9]
The shape of the molecule is a trigonal bipyramid, with two fluorine atoms at the top and bottom (apex) (Fa) and an electron pair, oxygen and fluorine (Fe) on the equator. [7] The Cl=O bond length is 1.405 Å, Cl-Fe 1.603 Å, other Cl-Fa 1.713 Å, ∠FeClO=109° ∠FaClO=95°, ∠FaClFe=88°. The molecule is polarised, Cl has a +1.76 charge, O has −0.53, equatorial F has −0.31 and apex F has −0.46. The total dipole moment is 1.74 D. [10]