The reaction of anthracene with OH radicals: An experimental study of the kinetics between 58 and 470K

Goulay, Fabien; Rebrion-Rowe, C.; Garrec, Jean-Luc Le; Picard, S. Le; Canosa, André; Rowe, B. R.

doi:10.1063/1.1857474

Cited by 42 publications

(46 citation statements)

References 29 publications

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“…(3)] are higher and show evidence of "fall-off" behavior. [29] The reactions between OH radicals and butenes [15] and OH and anthracene, [14] and probably those between CH and butenes and CH and benzene (red in Table 3) are presumed to occur by association: but now the adducts are sufficiently large that the kinetics are in the high-pressure limit, even at the relatively low pressures found in a CRESU expansion. at 298 K; orange print indicates reactions that proceed by pressure-dependent association; red print indicates reactions that probably proceed by association in the high-pressure limit.…”

Section: Rate Constants For Neutral-neutral Reactions and Their Tempementioning

confidence: 98%

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Reactions at Very Low Temperatures: Gas Kinetics at a New Frontier

2006

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Advances in experimental techniques, especially the development of the CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) method, allow many gas-phase molecular processes to be studied at very low temperatures. This Review focuses on the reactions of molecular and atomic radicals with neutral molecules. Rate constants for almost 50 such reactions have been measured at temperatures as low as 13 K by using the CRESU method. The surprising demonstration that so many reactions between electrically neutral species can be extremely rapid at these very low temperatures has excited interest both from theoreticians and from those seeking to understand the chemistry that gives rise to the 135 or so molecules that are present in low-temperature molecular clouds in the interstellar medium. Theoretical treatments of these reactions are based on the idea that a reaction occurs when the long-range potential between the reagent species brings them into close contact. The astrochemical context, theoretical studies, and the determination of the rate constants of these low-temperature reactions are critically discussed.

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Section: Rate Constants For Neutral-neutral Reactions and Their Tempementioning

confidence: 98%

“…The reservoir can also be heated if species are being used which have low vapor pressures at room temperature. [14] Expansion through the Laval nozzle then provides cooling, albeit not, of course, to temperatures as low as those attained when the reservoir is at ambient temperature or below.…”

Section: Astrochemistry: Molecules In Spacementioning

confidence: 99%

Reactions at Very Low Temperatures: Gas Kinetics at a New Frontier

2006

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“…47 It is suggested that the reaction could probably lead to the formation of cyclopropa [b]anthracene assuming that the mechanism proceeds by the addition of the CH radical to the π-system of the molecule followed by a H atom elimination.…”

Section: Ring Expansion Reaction Mechanismmentioning

confidence: 99%

Direct detection of pyridine formation by the reaction of CH (CD) with pyrrole: a ring expansion reaction

Soorkia

Taatjes

Osborn

et al. 2010

Phys. Chem. Chem. Phys.

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“…Recently, low temperature kinetic studies have been extended to aromatic species: benzene 12-14 and anthracene. 15,16 The low temperature reactivity of the CN radical has been investigated for a range of small hydrocarbons. 17 The reactions of CN with larger hydrocarbon species including allene and propyne were found to have rate coefficients of ~4 × 10 -10 cm 3 molecule -1 s -1 over the 15-294 K range.…”

Section: Introductionmentioning

confidence: 99%

Reactions of the CN Radical with Benzene and Toluene: Product Detection and Low-Temperature Kinetics

et al. 2009

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Low-temperature rate coefficients are measured for the CN + benzene and CN + toluene reactions using the pulsed Laval nozzle expansion technique coupled with laser-induced fluorescence detection. The CN + benzene reaction rate coefficient at 105, 165, and 295 K is found to be relatively constant over this temperature range, (3.9-4.9) × 10 -10 cm 3 molecule -1 s -1 . These rapid kinetics, along with the observed negligible temperature dependence, are consistent with a barrierless reaction entrance channel and reaction efficiencies approaching unity. The CN + toluene reaction is measured to have a rate coefficient of 1.3 × 10 -10 cm 3 molecule -1 s -1 at 105 K. At room temperature, nonexponential decay profiles are observed for this reaction that may suggest significant back-dissociation of intermediate complexes. In separate experiments, the products of these reactions are probed at room temperature using synchrotron VUV photoionization mass spectrometry. For CN + benzene, cyanobenzene (C 6 H 5 CN) is the only product recorded with no detectable evidence for a C 6 H 5 + HCN product channel. In the case of CN + toluene, cyanotoluene (NCC 6 H 4 CH 3 ) constitutes the only detected product. It is not possible to differentiate among the ortho, meta, and para isomers of cyanotoluene because of their similar ionization energies and the ∼40 meV photon energy resolution of the experiment. There is no significant detection of benzyl radicals (C 6 H 5 CH 2 ) that would suggest a H-abstraction or a HCN elimination channel is prominent at these conditions. As both reactions are measured to be rapid at 105 K, appearing to have barrierless entrance channels, it follows that they will proceed efficiently at the temperatures of Saturn's moon Titan (∼100 K) and are also likely to proceed at the temperature of interstellar clouds (10-20 K).

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The reaction of anthracene with OH radicals: An experimental study of the kinetics between 58 and 470K

Cited by 42 publications

References 29 publications

Reactions at Very Low Temperatures: Gas Kinetics at a New Frontier

Reactions at Very Low Temperatures: Gas Kinetics at a New Frontier

Direct detection of pyridine formation by the reaction of CH (CD) with pyrrole: a ring expansion reaction

Reactions of the CN Radical with Benzene and Toluene: Product Detection and Low-Temperature Kinetics

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