Thallium azide

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
Names
Other names
thallium azide
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
PubChem CID
CompTox Dashboard (EPA)
Properties
Chemical formula
 TlN3
Molar mass 246.4035
Appearance yellow-brown
Solubility in water
 insoluble
Structure
Crystal structure
 Tetragonal, tI16 [1]
Space group
 I4/mcm, No. 140
Hazards
Main hazards very toxic
EU classification (DSD) (outdated)
 T+ E C N
NFPA 704 (fire diamond)
0
4
3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Preparation and structure

Thallium azide can be prepared treating an aqueous solution of thallium(I) sulfate with sodium azide. Thallium azide will precipitate; the yield can be maximized by cooling.

TlN3, KN3, RbN3, and CsN3 adopt the same structures. The azide is bound to eight cations in an eclipsed orientation. The cations are bound to eight terminal N centers.[2]

Coordination sphere of azide in K,Rb,Cs,TlN3.

Safety

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

References
  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.
  2. Ulrich Müller "Verfeinerung der Kristallstrukturen von KN3, RbN3, CsN3 und TIN3" Zeitschrift für anorganische und allgemeine Chemie 1972, Volume 392, 159–166. doi:10.1002/zaac.19723920207


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