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    UV photolysis of quinoline in interstellar ice analogs

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    Author
    Elsila, Jamie E.
    Hammond, Matthew R.
    Bernstein, Max P.
    Sandford, Scott A.
    Zare, Richard N.
    Issue Date
    2006-01-01
    Keywords
    interstellar medium
    organic compounds
    astrochemistry
    
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    Citation
    Elsila, J. E., Hammond, M. R., Bernstein, M. P., Sandford, S. A., & Zare, R. N. (2006). UV photolysis of quinoline in interstellar ice analogs. Meteoritics & Planetary Science, 41(5), 785-796.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656138
    DOI
    10. 1111/j. 1945-5100. 2006. tb00992. x
    Additional Links
    https://meteoritical.org/
    Abstract
    The polycyclic aromatic nitrogen heterocycle (PANH) quinoline (C9H7N) was frozen at 20 K in interstellar ice analogs containing either pure water or water mixed with methanol or methane and exposed to ultraviolet (UV) radiation. Upon warming, the photolysis products were analyzed by high-performance liquid chromatography and nanoscale liquid chromatography-electrospray ionization mass spectrometry. A suite of hydroxyquinolines, which were formed by the addition of oxygen atoms to quinoline, was observed as the primary product in all the ices. Quinoline N oxide was not formed, but five hydroxyquinoline isomers were produced with no clear dominance of one isomer. Reduction products, formed by hydrogen atom addition, were also created. Ices created at 20 K with H2O: quinoline ratios of 10:1 to 100:1 showed similar product distributions to those at 122 K, with no apparent temperature or concentration dependence. Increasing the UV dose led to a decrease in overall yield, indicating that quinoline and its products may be photo-destroyed. Methylquinolines were formed upon photolysis of the methanol- and methane-containing ices. In addition, possible methoxyquinolines or quinoline methylene alcohols were formed in the methanolcontaining ice, while methylhydroxyquinolines were created in the methane-containing ice. This work indicates that oxidation of PANHs could occur in icy extraterrestrial environments and suggests that a search for such compounds in carbonaceous meteorites could illuminate the possible link between interstellar ice chemistry and meteoritic organics. Given the importance of oxidized and alkylated PANHs to biochemistry, the formation and delivery of such molecules to the early Earth may have played a role in the origin and evolution of life.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10. 1111/j. 1945-5100. 2006. tb00992. x
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    Meteoritics & Planetary Science, Volume 41, Number 5 (2006)

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