Английская Википедия:Fluorine azide

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Шаблон:Chembox Fluorine azide or triazadienyl fluoride is a yellow green gas composed of nitrogen and fluorine with formula Шаблон:Chem2. Its properties resemble those of [[Chlorine azide|Шаблон:Chem2]], [[Bromine azide|Шаблон:Chem2]], and [[Iodine azide|Шаблон:Chem2]]. 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.

Шаблон:Chem2

Шаблон:Chem2

Fluorine azide decomposes without explosion at normal temperatures to make dinitrogen difluoride:

Шаблон:Chem2.

At higher temperatures such as 1000 °C fluorine azide breaks up into nitrogen monofluoride radical:

Шаблон:Chem2

The FN itself dimerizes on cooling.

Шаблон:Chem2

Solid or liquid Шаблон:Chem2 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.

Шаблон:Chem2 adducts can be formed with the Lewis acids boron trifluoride (Шаблон:Chem2) and arsenic pentafluoride (Шаблон:Chem2) at -196 °C. These molecules bond with the N_α atom.

Properties

Spectroscopy

Parameter	Value	Unit
A	48131.448	MHz
B	5713.266	MHz
C	5095.276	MHz
μa	1.1
μb	0.7

Shape

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

Physical

Шаблон:Chem2 has a density of 1.3 g/cm³.

Шаблон:Chem2 adsorbs on to solid surfaces of potassium fluoride, but not onto lithium fluoride or sodium fluoride. This property was being investigated so that Шаблон:Chem2 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.

External links

• Шаблон:Commons category-inline