Silver+Azide

Structure and chemistry
Silver azide can be prepared by treating an [|aqueous] solution of [|silver nitrate] with [|sodium azide] The silver azide precipitates as a white solid, leaving [|sodium nitrate] in solution. AgNO3 (aq) + NaN3 (aq) → AgN3 (s) + NaNO3 (aq) [|X-ray crystallography] shows that AgN3 is a coordination polymer with [|square planar] Ag+ coordinated by four azide [|ligands]. Correspondingly, each end of each azide ligand is connected to a pair of Ag+ centers. The structure consists of two-dimensional AgN3 layers stacked one on top of the other, with weaker Ag–N bonds between layers. The coordination of Ag+ can alternatively be described as highly distorted 4 + 2 octahedral, the two more distant nitrogen atoms being part of the layers above and below. 3 || In its most characteristic reaction, the solid decomposes explosively, releasing nitrogen gas: 2 AgN3 (s) → 3 N2 (g) + 2 Ag (s) The first step in this decomposition is the production of free electrons and azide radicals; thus the reaction rate is increased by the addition of [|semiconducting] oxides. Pure silver azide explodes at 340 [|°C], but the presence of impurities lowers this down to 270 °C. This reaction has a lower [|activation energy] and initial delay than the corresponding decomposition of [|lead azide]. 034 || Except where noted otherwise, data are given for materials in their [|standard state (at 25 °C, 100 kPa)] ||
 * [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Silver-azide-high-T-single-layer-3D-balls.png/150px-Silver-azide-high-T-single-layer-3D-balls.png width="150" height="157" caption="Silver-azide-high-T-single-layer-3D-balls.png" link="http://en.wikipedia.org/wiki/File:Silver-azide-high-T-single-layer-3D-balls.png"]] || [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/8/82/Silver-azide-high-T-layer-stacking-3D-balls.png/250px-Silver-azide-high-T-layer-stacking-3D-balls.png width="250" height="134" caption="Silver-azide-high-T-layer-stacking-3D-balls.png" link="http://en.wikipedia.org/wiki/File:Silver-azide-high-T-layer-stacking-3D-balls.png"]] || [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Silver-azide-high-T-Ag-coordination-3D-balls-A.png/150px-Silver-azide-high-T-Ag-coordination-3D-balls-A.png width="150" height="165" caption="Silver-azide-high-T-Ag-coordination-3D-balls-A.png" link="http://en.wikipedia.org/wiki/File:Silver-azide-high-T-Ag-coordination-3D-balls-A.png"]] || [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Silver-azide-high-T-N-coordination-3D-balls-B.png/150px-Silver-azide-high-T-N-coordination-3D-balls-B.png width="150" height="133" caption="Silver-azide-high-T-N-coordination-3D-balls-B.png" link="http://en.wikipedia.org/wiki/File:Silver-azide-high-T-N-coordination-3D-balls-B.png"]] ||
 * Part of a layer || Layer stacking || 4 + 2 coordination of Ag+ || 2 + 1 coordination of N in N −
 * ~ Silver azide ||
 * [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Silver-azide-high-T-single-layer-3D-vdW.png/200px-Silver-azide-high-T-single-layer-3D-vdW.png width="200" height="203" link="http://en.wikipedia.org/wiki/File:Silver-azide-high-T-single-layer-3D-vdW.png"]] ||
 * ~ Identifiers ||
 * [|CAS number] || [|13863-88-2] ||
 * [|PubChem] || [|61698] ||
 * [|ChemSpider] || [|55601] [[image:http://upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png width="7" height="7" caption="Yes"]] ||
 * [|Jmol]-3D images || [|Image 1] ||
 * [|SMILES] ||
 * [|InChI] ||
 * ~ Properties ||
 * [|Molecular formula] || AgN3 ||
 * [|Molar mass] || 149.888 g/mol ||
 * Appearance || colorless solid ||
 * [|Density] || 4.42 g/cm3, solid ||
 * [|Melting point] || 250 °C, [|explosive] ||
 * [|Boiling point] || decomp. ||
 * [|Solubility] in other solvents || 2.0×10-8 g/L ||
 * ~ Structure ||
 * [|Crystal structure] || [|Orthorhombic] [|oI16][|[][|1][|]] ||
 * [|Space group] || Ibam, No 72 ||
 * ~ Hazards ||
 * Main [|hazards] || Very toxic, explosive ||
 * [|NFPA 704] || [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/75px-NFPA_704.svg.png width="75" height="75" caption="NFPA 704.svg" link="http://en.wikipedia.org/wiki/File:NFPA_704.svg"]]
 * = [[image:http://upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png width="14" height="14" caption="Yes"]] [|(verify)] [|(what is:] [[image:http://upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/10px-Yes_check.svg.png width="10" height="10" caption="Yes"]]/[[image:http://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/10px-X_mark.svg.png width="10" height="11"]]?)
 * = [|Infobox references] ||
 * Silver azide** is the [|chemical compound] with the [|formula] AgN3. This colorless solid is a well-known [|explosive].