Matrix isolation spectroscopy study of iron reactivity towards PAHs

Elustondo, F.; Dalibart, M.; Deroult, J; Mascetti, Joëlle

doi:10.1016/s1464-1917(99)00096-3

Cited by 6 publications

(9 citation statements)

References 24 publications

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“…This indicates that water coordinates to coronene with the highest index of local aromaticity, as already seen for iron/coronene p-complexes. 40 These observations have been further confirmed by adsorption of C 24 H 12 on an amorphous D 2 O ice film resulting in the decrease of the bare dD absorption at 2725 cm À147 and in the growth of a band at 2663 cm À1 , shifted by 62 cm À1 to lower wavenumbers with respect to the dD feature.…”

Section: Adsorption Of C 24 H 12 On a Water Ice Filmmentioning

confidence: 66%

“…Pressures are monitored by Pirani and Penning gauges (Edwards). 40 Inside the vacuum chamber, ice films or argon cryogenic matrices are condensed onto an infrared transparent substrate (CsBr) cooled down to 10 K by a Cryophysics Cryodine M22 closed cycle He refrigerator. The use of high vacuum conditions is necessary for the experiments performed in this work as cleaned surfaces must be maintained free of contamination for the duration of the measurements.…”

Section: Experimental and Theoretical Detailsmentioning

confidence: 99%

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

Guennoun

Aupetit

Mascetti

2011

Phys. Chem. Chem. Phys.

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UV photochemistry of a polycyclic aromatic hydrocarbon model, coronene (C(24)H(12)), 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 C(24)H(12) and H(2)O, 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.

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Section: Adsorption Of C 24 H 12 On a Water Ice Filmmentioning

confidence: 66%

Section: Experimental and Theoretical Detailsmentioning

confidence: 99%

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

Guennoun

Aupetit

Mascetti

2011

Phys. Chem. Chem. Phys.

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“…The experimental system used consists of a stainless steel high-vacuum chamber with a suspended CsBr window attached to the cold finger of a cryostat . The chamber is evacuated to P ≈ 10 −7 mbar by an Edwards diffusion pump backed by an Edwards two-stage rotary pump, and pressures are monitored using Pirani and Penning gauges (Edwards).…”

Section: Experimental and Theoretical Detailsmentioning

confidence: 99%

Photochemistry of Pyrene with Water at Low Temperature: Study of Atmospherical and Astrochemical Interest

2011

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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.

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“…Reaction products of iron atoms with polycyclic aromatic hydrocarbons (PAH) pyrene and coronene were studied by UV and Fourier IR spectroscopies in argon and nitrogen matrices. 102 The spectra of the co-condensates revealed the presence of mononuclear p-complexes of iron atom with pyrene, Fe(C 16 H 10 ) n (n = 1, 2), which are stable at temperatures of up to 24 K. In the structure of the p-complex, the iron atom is above the centre of one of the two outer aromatic rings. Formation of unstable Fe7H complexes with one or two hydrogen atoms of one aromatic ring of the ligand molecule or with two hydrogen atoms of different rings was also detected.…”

Section: Reactions Of Metal Atoms and Small Clusters In Low-temperatu...mentioning

confidence: 99%

Low-temperature reactions in the chemistry of nanosystems

Шабатина¹,

Sergeev²

2003

Russ. Chem. Rev.

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Infinite densities are non-normalizable quasi-probability distributions that can describe the long-time properties of systems when ergodicity is broken and the equilibrium Boltzmann-Gibbs distribution fails. Their experimental observation has remained elusive so far. We here perform semiclassical Monte Carlo simulations of cold atoms in dissipative optical lattices with realistic parameters. We show that the momentum infinite density, as well as its scale invariance, should be observable in shallow potentials. We further evaluate the momentum autocorrelation function both in the stationary and nonstationary, aging regime.

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Matrix isolation spectroscopy study of iron reactivity towards PAHs

Cited by 6 publications

References 24 publications

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

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

Photochemistry of Pyrene with Water at Low Temperature: Study of Atmospherical and Astrochemical Interest

Low-temperature reactions in the chemistry of nanosystems

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