title: Photochemistry of pyrene with water at low temperature: study of atmospherical and astrochemical interest.
abstract: Photochemistry of a polyaromatic hydrocarbon, pyrene C(16)H(10), with water has been investigated at cryogenic temperatures. Photoprocessing of this species, performed at λ > 235 nm, in argon matrices, adsorbed onto amorphous water surfaces, and trapped in solid water, led to the formation of ketonic isomers, C(16)H(10)O, and possibly quinones. These species have been identified for the first time by infrared spectroscopy with the support of isotopic substitution experiments and DFT calculations. These oxidized pyrene-like species, of atmospherical and astrochemical interest, most likely arise from a tautomeric rearrangement of their analogous hydroxylated molecules, these latter being formed by reaction of water with pyrene cations.
authors.affiliation: Institut des Sciences Moléculaires, Université de Bordeaux, UMR 5255 CNRS 351, Cours de la Libération, 33405 Talence cedex, France.
authors.forename: Zohra
authors.initials: Z
authors.lastname: Guennoun
authors.forename: Christian
authors.initials: C
authors.lastname: Aupetit
authors.forename: Joëlle
authors.initials: J
authors.lastname: Mascetti
mesh_terms: D000327:Adsorption; D001128:Argon / Q000737:chemistry; D001272:Atmosphere; D005118:Extraterrestrial Environment / Q000737:chemistry*; D007053:Ice; D055668:Photochemical Processes; D011721:Pyrenes / Q000737:chemistry*; D013057:Spectrum Analysis; D013499:Surface Properties; D013696:Temperature; D014466:Ultraviolet Rays; D014732:Vibration; D014867:Water / Q000737:chemistry*
chemical_list: D007053:Ice; D011721:Pyrenes; D014867:Water; D001128:Argon; C030984:pyrene