Picene

Picene

Picene

Chemical compound

For other uses, see Picene (disambiguation) and Piceno (disambiguation).

Picene is a hydrocarbon found in the pitchy residue obtained in the distillation of peat tar and of petroleum. This is distilled to dryness and the distillate repeatedly recrystallized from cymene. It may be synthetically prepared by the action of anhydrous aluminium chloride on a mixture of naphthalene and 1,2-dibromoethane, or by distilling a-dinaphthostilbene. It crystallizes in large colorless plates which possess a blue fluorescence. It is soluble in concentrated sulfuric acid with a green color. Chromic acid in glacial acetic acid solution oxidizes it to picene-quinone, picene-quinone carboxylic acid, and finally to phthalic acid.

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When intercalated with potassium or rubidium and cooled to below 18 K, picene has been reported to exhibit superconductive properties.[3] However, due to the apparent inability to reproduce this work,[4] the superconducting nature of doped picene has been met with heavy scepticism.[5]

Picene is also a major constituent of the hydrocarbon mineral idrialite.

See also

  • Olympicene, which has the same number of rings linked in a different way

References

  1. [1]
    Merck Index, 11th Edition, 7368.
  2. [2]
    Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 206. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
  3. [3]
    Das, Saswato (March 2010), "Hydrocarbon Superconductor Discovered", IEEE Spectrum
  4. [4]
    Artioli, Gianluca A.; Malavasi, Lorenzo (Dec 2013), "Superconductivity in metal-intercalated aromatic hydrocarbons", J. Mater. Chem. C, 2 (9): 1577, doi:10.1039/C3TC32326A
  5. [5]
    Heguri, Satoshi; Kobayashi, Mototada; Tanigaki, Katsumi (May 2015), "Questioning the existence of superconducting potassium doped phases for aromatic hydrocarbons", Phys. Rev. B, 92 (1): 014502, Bibcode:2015PhRvB..92a4502H, doi:10.1103/PhysRevB.92.014502

 This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Picene". Encyclopædia Britannica. Vol. 21 (11th ed.). Cambridge University Press. p. 581.
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