Zinc azide

Zinc azide
Names
	IUPAC name Zinc(II) azide
	Other names Zinc diazide
Identifiers
3D model (JSmol)	Interactive image;
ChemSpider	26583533;
PubChem CID	131722987;
	InChI InChI=1S/2N3.Zn/c21-3-2;/q2-1;+2 Key: QFDUTPNKBRXHTC-UHFFFAOYSA-N;
	SMILES [N-]=[N+]=[N-].[N-]=[N+]=[N-].[Zn+2];
Properties
Chemical formula	Zn(N3)2
Molar mass	149.4 g/mol
Appearance	white solid
Density	2.559 g/cm3 (alpha polymorph)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Zinc azide (Zn(N₃)₂) is an inorganic compound composed of zinc and azide. It is a white, explosive solid that can be prepared by the protonolysis of diethylzinc with hydrazoic acid:^[1]

Zn(C₂H₅)₂ + 2 HN₃ → Zn(N₃)₂ + 2 C₂H₆

Properties[]

Zinc azide is a coordination polymer which crystallizes in three polymorphs, all of which feature tetrahedral zinc centers and bridging azide ligands. α-Zn(N₃)₂ crystallizes in the monoclinic space group and is stable, while the other two polymorphs are metastable. P2₁/n. β-Zn(N₃)₂ is trigonal, space group P3₂21, and γ-Zn(N₃)₂ is monoclinic, space group C2.

It is easily hydrolyzed, and attempts to prepare it in aqueous solution resulted in the precipitation of basic azides Zn(OH)_2-x(N₃)_x (x = 0.9–1.0). Both the α- and β-forms were found to be very friction- and shock-sensitive, violently exploding in blue flashes, but can be made to decompose slowly by gentle heating, giving off nitrogen gas. In a sealed glass tube with inert atmosphere, this yields zinc nitride, Zn₃N₂.^[1]

References[]

^ ^a ^b Schulz, Axel; Villanger, Alexander (2016). "Binary Zinc Azides". Chemistry: A European Journal. 22 (6): 2032–2038. doi:10.1002/chem.201504524. PMID 26749253.

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[Schulz-1] Schulz, Axel; Villanger, Alexander (2016). "Binary Zinc Azides". Chemistry: A European Journal. 22 (6): 2032–2038. doi:10.1002/chem.201504524. PMID 26749253.

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