thallium azide
{{chembox
| Verifiedfields = changed
| verifiedrevid = 470605424
| ImageFile = KN3viewCropped.tif
| ImageSize = 200px
| IUPACName = Thallium(I) azide
| OtherNames = thallium azide
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 15368504
| InChI = 1/N3.Tl/c1-3-2;/q-1;+1
| InChIKey = GMUSFHMEMWCQIE-UHFFFAOYAP
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/N3.Tl/c1-3-2;/q-1;+1
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = GMUSFHMEMWCQIE-UHFFFAOYSA-N
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo = 13847-66-0
| PubChem = 22764821
| SMILES = [Tl+].[N-]=[N+]=[N-]
}}
|Section2={{Chembox Properties
| Formula = {{chem2|TlN3}}
| Tl=1|N=3
| Appearance = yellow-brown crystals
| Density =
| MeltingPt =
| BoilingPt =
| Solubility = insoluble
}}
|Section3={{Chembox Structure
| CrystalStruct = Tetragonal, tI16{{cite journal| journal = J. Chem. Phys.| year = 1973 | volume = 59 | pages = 3770–3776| title = Thermal expansion and low temperature phase transition of thallous azide|author1=Mauer F.A. |author2=Hubbard C.R. |author3=Hahn T.A. | doi = 10.1063/1.1680549| issue = 7| bibcode = 1973JChPh..59.3770M }}
| SpaceGroup = I4/mcm, No. 140
}}
|Section7={{Chembox Hazards
| GHS_ref=
| GHSPictograms = {{GHS01}} {{GHS06}} {{GHS08}} {{GHS09}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|}}
| PPhrases = {{P-phrases|}}
| MainHazards = very toxic
| NFPA-H = 4
| NFPA-F = 0
| NFPA-R = 3
| FlashPt =
| AutoignitionPt =
}}
}}
Thallium azide, {{chem2|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.
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.
{{chem2|TlN3}}, {{chem2|KN3}}, {{chem2|RbN3}}, and {{chem2|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.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}}
Safety
All thallium compounds are poisonous and should be handled with care. Azide salts are also roughly as toxic as their corresponding cyanide salts.{{cite journal | last=Chang | first=Soju | last2=Lamm | first2=Steven H. | title=Human Health Effects of Sodium Azide Exposure: A Literature Review and Analysis | journal=International Journal of Toxicology | volume=22 | issue=3 | date=2003 | issn=1091-5818 | doi=10.1080/10915810305109 | pages=175–186}}