Other metal azides

Martin [126] prepared nickel, cobalt, zinc and manganese azides by the action of an ether solution of hydrazoic acid on the dry metal carbonate. Cuprous azide, CuN3, was obtained in the form of a light grey sediment by the reaction of sodium azide with a solution of cuprous sulphate. 

The preparation of ferric azide failed, however, due to the formation of basic ferric azide. A complex compound was obtained by Martin from chromium hydroxide and hydrazoic acid. It contained no chromium or N ions and has the probable formula of a complex compound [Cr(N3)4]H. 

Martin carried out extensive research into the explosive properties of the azides of various metals (Table 33). The high sensitiveness of cuprous azide to impact is noteworthy. 

Azide Ignition temperature °C Sensitiveness to impact (work in kgm/cm2) Minimum initial charge, g  

Mercuric azide, Hg(N3)2, occurs in two allotropic modifications a (orthorhombic) and P (monoclinic), like lead azide (Miles [75] Garner and Gomm [37]). The latter is obtained like /Mead azide, by slow diffusion of the solutions. During crystallization spontaneous explosion may occur. Mercuric azide also explodes during crystallization from a hot, aqueous solution. 

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See Other METAL AZIDE HALIDES, silver compounds... 

The precipitate from cerium nitrate and sodium azide is explosive. See other metal azides... 

See Sodium azide Heavy metals See other METAL AZIDES... 

Nitrogen Is binding energies have been determined by AT-ray p.e. spectroscopy for [Rh(CO)2(N3)]2, together with some other metal azides. The similarity of their spectra to that of sodium azide suggests that the internal bonding of N3 is little affected by co-ordination i.e. the Rh—N3 bond is essentially ionic. 

With sodium thiosulphate the arsenite forms oxythioarsenates (see p. 282), as it also does with tri- and tetra-thionates sodium dithionate does not react either in cold or boiling solution. Sodium tellurate causes oxidation to arsenate.1 An ammoniacal solution of silver azide is reduced to silver by sodium arsenite other metallic azides do not react. 

See other METAL AZIDE HALIDES, SILVER COMPOUNDS... 

Bailar, 1973, Vol. 3, 217 Zinc azide is said to explode easily. See SODIUM AZIDE HEAVY METALS See other METAL AZIDES... 

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