Thallium azide

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Thallium azide
PubChem 22764821
ChemSpider 15368504 YesY
Jmol-3D images Image 1
Molecular formula TlN3
Molar mass 246.4035
Appearance yellow-brown
Solubility in water insoluble
Crystal structure Tetragonal, tI16 [1]
Space group I4/mcm, No. 140
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Thallium azide, TlN3, is a yellow-brown crystalline solid poorly soluble in water. Although it is not nearly as sensitive to shock or friction as lead azide, it can easily be detonated by a flame or spark. It can be stored safely dry in a closed non-metallic container.


Thallium azide can be prepared by dissolving thallium(I) sulfate in water, and adding sodium azide solution. Thallium azide will precipitate; the yield can be maximized by cooling in a freezer.


All thallium compounds are poisonous and should be handled with care; avoid breathing any dust or fumes.


  1. ^ Mauer F.A., Hubbard C.R., Hahn T.A. (1973). "Thermal expansion and low temperature phase transition of thallous azide". J. Chem. Phys. 59 (7): 3770–3776. doi:10.1063/1.1680549.