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azulene
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ultraviolet-visible spectrum of azulene
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azulene

chemistry
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ultraviolet-visible spectrum of azulene
ultraviolet-visible spectrum of azulene In the ultraviolet-light spectrum of an organic chemical compound that contains conjugated bonds, as in the case of azulene, the amount of light absorbed by each bond transition is plotted on the vertical axis. The wavelength of the absorbed light is plotted horizontally.

Azulene is a chemical compound with a distinctive blue color. It can refer to a specific liquid hydrocarbon (C15H18) found in some essential oils and lignite tar, or more broadly to related blue, violet, or green hydrocarbons. A synthetic form, cyclo-penta-cyclo-heptene (C10H8), is also known and is chemically more active than naphthalene.1

Azulene is classified as a nonbenzenoid aromatic compound. Despite having the same number of pi electrons (10) as naphthalene, which is also aromatic, azulene exhibits aromatic properties. This aromaticity is linked to its cyclic conjugated system of double bonds.2

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2 Britannica Sources
  1. azulene
  2. hydrocarbon - Polycyclic nonaromatic compounds

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