Nitrosyl azide

Structural formula
General
Surname	Nitrosyl azide
other names	Tetra nitrogen monoxide; Tetra nitrogen oxide;
Molecular formula	NON 3
Brief description	pale yellow solid
External identifiers / databases
PubChem	18974641
ChemSpider	13917998
Wikidata	Q425032
properties
Molar mass	72.03 g mol −1
Melting point	−60 ° C to −55 ° C; −59 ° C;
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Nitrosyl azide ( tetra nitrogen monoxide ) is an unstable nitric oxide that can be seen as both an inorganic covalent azide and a nitrosyl compound . The nitrogen content in the molecule is 77.79%.

Presentation and extraction

The first manufacture was described in 1958. It is manufactured by reacting sodium azide with nitrosyl chloride at temperatures below −50 ° C. The product is obtained from the reaction mixture by vacuum distillation.

Instead of nitrosyl chloride, nitrosyl hydrogen sulfate and nitrous acid can also be used as NO sources .

properties

Nitrosyl azide can be obtained as a pale yellow solid below −50 ° C. The melting point is given in the range from −60 ° C to −55 ° C. According to August, the vapor pressure function results according to lg (P) = −A / T + B (P in Torr, T in K) with A = 1215.6 and B = 7.306. A normal pressure boiling point of 1.5 ° C can be estimated by extrapolation. This cannot be achieved in practice, since the compound breaks down into nitrous oxide and nitrogen above −50 ° C. A quantum chemical ab initio calculation resulted in a strongly exothermic heat of reaction of −381 kJ mol ⁻¹ for the decay .

Characterization was carried out by means of infrared and Raman spectroscopy , the measured bands agreeing well with calculated values for a trans chain structure. Quantum chemical calculations showed a cis chain shape with 4.2 kJ mol ^{−1, which is more} energetic , and an aromatic 6π ring shape that is 54.4 kJ mol ⁻¹ more stable. For the cyclization reaction, a very high activation energy of 205 kJ · mol ⁻¹ would have to be applied because of the bending of the azide function. This can be seen as the reason that the nitrosyl azide is so stable and can be isolated at low temperatures. The cyclic form quickly breaks down into nitrous oxide and nitrogen.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Schulz, A .; Tornieporth-Oetting, IC; Klapötke, TM : Nitrosyl azide, N ₄ O, an intrinsically unstable oxide of nitrogen in Angew. Chem. Int. Ed. 32 (1993) 1610-1612; doi : 10.1002 / anie.199316101 .
↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Lucien, HW: The preparation and properties of nitrosyl azide in J. Am. Chem. Soc. 80 (1958) 4458-4460, doi : 10.1021 / ja01550a004 .
↑ Entry on nitrogen oxides. In: Römpp Online . Georg Thieme Verlag, accessed on April 17, 2014.
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Schulz-1] ↑ ^a ^b ^c ^d ^e ^f ^g Schulz, A .; Tornieporth-Oetting, IC; Klapötke, TM : Nitrosyl azide, N ₄ O, an intrinsically unstable oxide of nitrogen in Angew. Chem. Int. Ed. 32 (1993) 1610-1612; doi : 10.1002 / anie.199316101 .

[Lucien-2] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Lucien, HW: The preparation and properties of nitrosyl azide in J. Am. Chem. Soc. 80 (1958) 4458-4460, doi : 10.1021 / ja01550a004 .

[3] Entry on nitrogen oxides. In: Römpp Online . Georg Thieme Verlag, accessed on April 17, 2014.

[NV-4] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.