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Issue 16, 2011
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Photochemistry of coronene with water at 10 K: first tentative identification by infrared spectroscopy of oxygen containing coronene products

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Abstract

UV photochemistry of a polycyclic aromatic hydrocarbon model, coronene (C24H12), has been investigated when it is in interaction with water in argon cryogenic matrices, adsorbed on amorphous water ice films, and embedded in solid water. Photoprocessing, carried out at 10 K and λ > 235 nm by means of a high-pressure Hg arc lamp, results in the oxidation and reduction of coronene. These species have been tentatively identified as being the 1,10-dihydroxycoronene and the 1,10-coroquinone by FTIR spectroscopy with the support of isotopic experiments and DFT calculations. These photochemical products most likely form, after hydrogen bonding between C24H12 and H2O, through ionization of the PAH and subsequent reactivity with water upon irradiation. Cations, thus generated, react subsequently with water yielding the production of oxygen containing coronene compounds. Such species are of particular interest as they may form in interstellar and early Solar System ices, and are also of astrobiological significance as they could play an important role in processes taking place in most of the living organisms.

Graphical abstract: Photochemistry of coronene with water at 10 K: first tentative identification by infrared spectroscopy of oxygen containing coronene products

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Article information


Submitted
08 Sep 2010
Accepted
16 Feb 2011
First published
22 Mar 2011

Phys. Chem. Chem. Phys., 2011,13, 7340-7347
Article type
Paper

Photochemistry of coronene with water at 10 K: first tentative identification by infrared spectroscopy of oxygen containing coronene products

Z. Guennoun, C. Aupetit and J. Mascetti, Phys. Chem. Chem. Phys., 2011, 13, 7340
DOI: 10.1039/C0CP01756F

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