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Chlorine azide
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| Names | |||
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| IUPAC name
Chlorine azide
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| Identifiers | |||
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |||
| ClN3 | |||
| Molar mass | 77.4731 g/mol | ||
| Appearance | Yellow-orange liquid; colorless gas | ||
| Melting point | −100 °C (−148 °F; 173 K) | ||
| Boiling point | −15 °C (5 °F; 258 K) | ||
| Solubility | Soluble[vague] in butane, pentane, benzene, methanol, ethanol, diethyl ether, acetone, chloroform, carbon tetrachloride, and carbon disulfide; slightly soluble in water | ||
| Structure | |||
| orthorhombic | |||
| Cmc 21, No. 36[1] | |||
| Explosive data | |||
| Shock sensitivity | Extreme | ||
| Friction sensitivity | Extreme | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards
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Extremely sensitive explosive | ||
| NFPA 704 (fire diamond) | |||
| Related compounds | |||
Related compounds
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Hydrazoic acid Fluorine azide Bromine azide Iodine azide | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chlorine azide (ClN3) is an inorganic compound that was discovered in 1908 by Friedrich Raschig.[2] Concentrated ClN3 is notoriously unstable and may spontaneously detonate at any temperature.[3]
Preparation and reactions
[edit]Chlorine azide is prepared by passing chlorine gas over silver azide, or by an addition of acetic acid to a solution of sodium hypochlorite and sodium azide.[4]
Chlorine azide further reacts with silver azide to produce a very unstable allotrope of nitrogen, hexanitrogen (N6), which decomposes to dinitrogen above 80 K (−193.2 °C; −315.7 °F).[5]
Explosive characteristics
[edit]Chlorine azide is extremely sensitive. It may explode, sometimes even without apparent provocation; it is thus too sensitive to be used commercially unless first diluted in solution. Chlorine azide reacts explosively with 1,3-butadiene, ethane, ethene, methane, propane, phosphorus, silver azide, and sodium. On contact with acid, chlorine azide decomposes, evolving toxic and corrosive hydrogen chloride gas.[6]
Regulatory information
[edit]Its shipment is subject to strict reporting requirements and regulations by the US Department of Transportation.
References
[edit]- ^ Lyhs, Benjamin; Bläser, Dieter; Wölper, Christoph; Schulz, Stephan; Jansen, Georg (2012). "A Comparison of the Solid-State Structures of Halogen Azides XN3 (X=Cl, Br, I)". Angewandte Chemie International Edition. 51 (51): 12859–12863. doi:10.1002/anie.201206028. PMID 23143850.
- ^ Frierson, W. J.; Browne, A. W. (1943). "Chlorine Azide. II. Interaction of Chlorine Azide and Silver Azide. Azino Silver Chloride, N3AgCl". Journal of the American Chemical Society. 65 (9): 1698–1700. Bibcode:1943JAChS..65.1698F. doi:10.1021/ja01249a013.
- ^ Frierson, W. J.; Kronrad, J.; Browne, A. W. (1943). "Chlorine Azide, ClN3. I.". Journal of the American Chemical Society. 65 (9): 1696–1698. Bibcode:1943JAChS..65.1696F. doi:10.1021/ja01249a012.
- ^ Raschig, F. (1908). "Über Chlorazid N3Cl". Berichte der Deutschen Chemischen Gesellschaft. 41 (3): 4194–4195. doi:10.1002/cber.190804103130.
- ^ Qian, Weiyu; Mardyukov, Artur; Schreiner, Peter R. (2025). "Preparation of a neutral nitrogen allotrope hexanitrogen C2h-N6". Nature. 642 (8067): 356–360. doi:10.1038/s41586-025-09032-9. ISSN 0028-0836. PMC 12158757. PMID 40500322.
- ^ CID 61708 from PubChem
External links
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Media related to Chlorine azide at Wikimedia Commons
