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Cyanogen

This article is about the chemical compound. For the Android-based operating system, see CyanogenMod.
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Cyanogen
Skeletal formula of cyanogen

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IUPAC name
  • Ethanedinitrile[3] (substitutive)
  • Bis(nitridocarbon)(CC)[3] (additive)
Other names
  • Dicyan[1][2]
  • Carbon nitride[1]
  • Oxalic acid dinitrile[2]
  • Dicyanogen
  • Nitriloacetonitrile
  • Oxalonitrile[1]
  • Oxalyl cyanide
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1732464 460-19-5 7pxY ChEBI CHEBI:29308 7pxY ChemSpider 9605 7pxY EC number 207-306-5 1090 Jmol-3D images Image MeSH cyanogen PubChem Template:Chembox PubChem/format RTECS number GT1925000 UN number 1026 colspan=2 style="background:#f8eaba; border-top:2px solid transparent; border-bottom:2px solid transparent; text-align:center;" #REDIRECTmw:Help:Magic words#Other
This page is a soft redirect. Properties

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C2N2 Molar mass Lua error in Module:Math at line 495: attempt to index field 'ParserFunctions' (a nil value). g·mol−1 Appearance Colourless gas Odor pungent, almond-like Density 950 mg mL−1 (at −21 °C) Melting point Script error: No such module "convert". Boiling point Script error: No such module "convert". 45 g/100 mL (at 20 °C) Solubility soluble in ethanol, ethyl ether Vapor pressure 5.1 atm (21°C)[4] 1.9 μmol Pa−1 kg−1 1.327 (18 °C) colspan=2 style="background:#f8eaba; border-top:2px solid transparent; border-bottom:2px solid transparent; text-align:center;" #REDIRECTmw:Help:Magic words#Other
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241.57 J K−1 mol−1 309.07 kJ mol−1 −1.0978–−1.0942 MJ mol−1 colspan=2 style="background:#f8eaba; border-top:2px solid transparent; border-bottom:2px solid transparent; text-align:center;" #REDIRECTmw:Help:Magic words#Other
This page is a soft redirect. Hazards

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SDS inchem.org Main hazards forms cyanide in the body; flammable[4] EU Index 608-011-00-8 EU classification Extremely Flammable F+ Toxic T Dangerous for the Environment (Nature) N R-phrases R12, R23, R50/53 S-phrases (S1/2), S16, S33, S45, S63 NFPA 704

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Explosive limits 6.6–32%[4] US health exposure limits (NIOSH):

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This page is a soft redirect. Related compounds

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Related alkanenitriles
Related compounds
DBNPA
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 14pxY verify (what is10pxY/10pxN?) Infobox references

Cyanogen is the chemical compound with the formula (CN)2. It is a colorless, toxic gas with a pungent odor. The molecule is a pseudohalogen. Cyanogen molecules consist of two CN groups – analogous to diatomic halogen molecules, such as Cl2, but far less oxidizing. The two cyano groups are bonded together at their carbon atoms: N≡C−C≡N, although other isomers have been detected.[5] Certain derivatives of cyanogen are also called "cyanogen" even though they contain only one CN group. For example cyanogen bromide has the formula NCBr.[6]

Cyanogen is the anhydride of oxamide:

H2NC(O)C(O)NH2 → NCCN + 2 H2O

although oxamide is manufactured from cyanogen by hydrolysis:[7]

NCCN + 2 H2O → H2NC(O)C(O)NH2

Preparation

Cyanogen is typically generated from cyanide compounds. One laboratory method entails thermal decomposition of mercuric cyanide:

2 Hg(CN)2 → (CN)2 + Hg2(CN)2

Alternatively, one can combine solutions of copper(II) salts (such as copper(II) sulfate) with cyanides, an unstable copper(II) cyanide is formed which rapidly decomposes into copper(I) cyanide and cyanogen.[8]

2 CuSO4 + 4 KCN → (CN)2 + 2 CuCN + 2 K2SO4

Industrially, it is created by the oxidation of hydrogen cyanide, usually using chlorine over an activated silicon dioxide catalyst or nitrogen dioxide over a copper salt. It is also formed when nitrogen and acetylene are reacted by an electrical spark or discharge.[9]

Paracyanogen

Paracyanogen can be best prepared by heating mercuric cyanide. It can also be prepared by heating silver cyanide, silver cyanate, cyanogen iodide or cyanuric iodide.[10] It can also be prepared by the polymerization of cyanogen at 300-500 °C in the presence of trace impurities. Paracyanogen can also be converted back to cyanogen by heating to 800 °C.[7] Based on experimental evidence, the structure of this polymeric material is thought to be rather irregular, with most of the carbon atoms being of sp2 type and localized domains of pi conjugation.[11]

History

Cyanogen was first synthesized in 1815 by Joseph Louis Gay-Lussac, who determined its empirical formula and named it. Gay-Lussac coined the word "cyanogène" from the Greek words κυανός (kyanos, blue) and γεννάω (gennao, I create), because cyanide was first isolated by the Swedish chemist Carl Wilhelm Scheele from the pigment "Prussian blue".[12] By the 1850s, cyanogen soap was used by photographers to remove silver stains from their hands. [13] It attained importance with the growth of the fertilizer industry in the late nineteenth century and is still an important intermediate in the production of many fertilizers. It is also used as a stabilizer in the production of nitrocellulose.

Cyanogen is a highly toxic compound, and in 1910 a spectroscopic analysis of Halley's Comet found cyanogen in the comet's tail. This led to public fear that the Earth would be poisoned as it passed through the tail. Because of the extremely diffuse nature of the tail, there was no effect when the planet passed through it.[14][15]

Safety

Like other inorganic cyanides, cyanogen is very toxic, as it readily undergoes reduction to cyanide, which poisons the cytochrome c oxidase complex, thus interrupting the mitochondrial electron transfer chain. Cyanogen gas is an irritant to the eyes and respiratory system. Inhalation can lead to headache, dizziness, rapid pulse, nausea, vomiting, loss of consciousness, convulsions, and death, depending on exposure.[16] Lethal dose through inhalation typically ranges from 100 to 150 mg. Inhalation of 900 ppm over a period of 10 min is considered lethal.[17]

Cyanogen produces the second hottest known natural flame (after carbon subnitride) with a temperature of over 4525 °C (or 8177 °F) when it burns in oxygen.[18][19]

See also

References

  1. ^ a b c NIOSH Pocket Guide to Chemical Hazards. Department of Health and Human Services, Centers for Disease Control, National Institute for Occupational Safety & Health. September 2007. p. 82. 
  2. ^ a b The Merck Index (10th ed.). Rahway, NJ: Merck & Co. 1983. p. 385. 
  3. ^ a b "oxalonitrile (CHEBI:29308)". Chemical Entities of Biological Interest. UK: European Bioinformatics Institute. 27 October 2006. Main. Retrieved 6 June 2012. 
  4. ^ a b c d e f "NIOSH Pocket Guide to Chemical Hazards #0161". National Institute for Occupational Safety and Health (NIOSH). 
  5. ^ Ringer, A. L.; Sherrill, C. D.; King, R. A.; Crawford, T. D. (2008). "Low-lying singlet excited states of isocyanogen". International Journal of Quantum Chemistry 106 (6): 1137–1140. Bibcode:2008IJQC..108.1137R. doi:10.1002/qua.21586. 
  6. ^ Hartman, W. W.; Dreger, E. E. (1931). "Cyanogen Bromide" (PDF). Org. Synth. 11: 30. ; Coll. Vol. 2, p. 150 
  7. ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 320–321. ISBN 0080379419. 
  8. ^ Brotherton, T. K.; Lynn, J. W. (1959). "The Synthesis And Chemistry Of Cyanogen". Chemical Reviews 59 (5): 841–883. doi:10.1021/cr50029a003. 
  9. ^ Breneman, A. A. (1889). "The Fixation of Atmospheric Nitrogen". Journal of the American Chemical Society 11 (1): 2–27. doi:10.1021/ja02126a001.  |chapter= ignored (help)
  10. ^ Bircumshaw, L. L.; F. M. Tayler and D. H. Whiffen (1954). "Paracyanogen: its formation and properties. Part I". J. Chem. Soc.: 931–935. doi:10.1039/JR9540000931. 
  11. ^ Maya, Leon (1993). "Paracyanogen Reexamined". Polymer Science: Part A 31: 2595–2600. 
  12. ^ Gay-Lussac, J. L. (1815). "Recherches sur l'acide prussique". Annales de Chimie 95: 136–231. 
  13. ^ Crookes, William, ed. (1859). "Photographic News: A Weekly Record of the Process of the Photography". pp. 11–11. 
  14. ^ Comet's Poisonous Tail
  15. ^ Halley's Comet 100 years Ago
  16. ^ Muir, G. D., ed. (1971). Hazards in the Chemical Laboratory. London: The Royal Institute of Chemistry. 
  17. ^ Ledgard, Jared (2006). A Laboratory History of Chemical Warfare Agents. Lulu.com. ISBN 0615136451.  p. 82.
  18. ^ Thomas, N.; Gaydon, A. G.; Brewer, L. (1952). "Cyanogen Flames and the Dissociation Energy of N2". The Journal of Chemical Physics 20 (3): 369–374. Bibcode:1952JChPh..20..369T. doi:10.1063/1.1700426. 
  19. ^ J. B. Conway , R. H. Wilson Jr., A. V. Grosse (1953). "THE TEMPERATURE OF THE CYANOGEN-OXYGEN FLAME". Journal of the American Chemical Society 75 (2): 499. doi:10.1021/ja01098a517. 


External links

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