Fluorine azide or triazadienyl fluoride is a yellow green gas composed of

nitrogen Nitrogen is a chemical element; it has Symbol (chemistry), symbol N and atomic number 7. Nitrogen is a Nonmetal (chemistry), nonmetal and the lightest member of pnictogen, group 15 of the periodic table, often called the Pnictogen, pnictogens. ...

and

fluorine Fluorine is a chemical element; it has Chemical symbol, symbol F and atomic number 9. It is the lightest halogen and exists at Standard temperature and pressure, standard conditions as pale yellow Diatomic molecule, diatomic gas. Fluorine is extre ...

with formula . Its properties resemble those of , , and . The bond between the fluorine atom and the nitrogen is very weak, leading to this substance being very unstable and prone to explosion. Calculations show the F–N–N angle to be around 102° with a straight line of 3 nitrogen atoms. The gas boils at –30° and melts at –139 °C. It was first made by John F. Haller in 1942.

Reactions

Fluorine azide can be made by reacting hydrazoic acid or sodium azide, with fluorine gas. : : Fluorine azide decomposes without explosion at normal temperatures to make dinitrogen difluoride: :. At higher temperatures such as 1000 °C fluorine azide breaks up into nitrogen monofluoride radical: : The FN itself dimerizes on cooling. : Solid or liquid can explode, releasing a large amount of energy. A thin film burns at the rate of 1.6 km/s. Due to the explosion hazard, only very small quantities of this substance should be handled at a time. adducts can be formed with the Lewis acids boron trifluoride () and arsenic pentafluoride () at -196 °C. These molecules bond with the first nitrogen atom from the fluorine.

Properties

Spectroscopy

Shape

Distances between atoms are F–N 0.1444 nm, FN=NN 0.1253 nm and FNN=N 0.1132 nm.

Physical

has a density of 1.3 g/cm³. adsorbs on to solid surfaces of potassium fluoride, but not onto lithium fluoride or sodium fluoride. This property was being investigated so that could boost the energy of solid propellants. The ultraviolet photoelectric spectrum shows ionisation peaks at 11.01, 13,72, 15.6, 15.9, 16.67, 18.2, and 19.7 eV. Respectively these are assigned to the orbitals: π, n_N or n_F, n_F, π_F, n_N or σ, π and σ.

References

External links

* {{Azides Fluorine compounds Azido compounds Gases with color Explosive gases Explosive chemicals Pseudohalogens