Low Pressure Gas-phase Reactions of the Atomic Oxygen Radical Anion with Halomethanes Studied Using Fourier Transform Ion Cyclotron Resonance

Abstract

Low pressure gas-phase reactions of the atomic oxygen radical anion with halomethanes studied using Fourier transform ion cyclotron resonance Staneke, P.O.; Kauw, J.; Born, M.; Ingemann Jorgensen, S.; Nibbering, N.M.M. Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.

Mechanisms for the Breakdown of Halomethanes through Reactions with Ground‐State Cyano Radicals

“…This is consistent with observations for halomethanes and oxygen radical anions, where reactions with bromine are competitive while chlorine reactions are not. [26] The difference in barrier height between hydrogen and halogen abstraction is not large enough to discriminate between the two mechanisms, but the rate constant is high in any case (2.0×10 9 s 1 M -1 for hydrogen abstraction).…”

Hydrogen/chlorine exchange reactions of gaseous carbanions

“…While nitromethyl carbanion reacted slowly but completely to give CH 3 SCHNO 2 Ϫ as the sole primary product ion, cyanomethyl carbanion also underwent substitution at sulfur. However, the reactivity of these carbanions towards halogenated compounds, especially haloalkanes, has seen little study although the gasphase ion/molecule reactions with neutral halomethanes have been extensively investigated by Grabowski et al [7], Knighton and Grimsrud [8], and Nibbering and coworkers [9,10]. Products arising from dissociative electron-transfer (DET), S N 2 nucleophilic substitution, and proton abstraction reactions were observed.…”

Oxygen anion (O−) and hydroxide anion (HO−) reactivity with a series of old and new refrigerants

“…Obtained in an Fourier transform ion cyclotron resonance apparatus and production of HO − from H 2 O …”

“…Selected ion flow tube is known to react at thermal energy as high pressures are involved; on the contrary, FT‐ICR may imply a limited excess of energy and then differences in ratio of reaction paths. The reactivity of various halogenated compounds has been studied with these 2 precursors, but mainly with older refrigerants such as CFCs and HCFCs, and with some trihalomethanes (THMs) (chloroform and bromoform and less commonly CHCl 2 Br and CHClBr 2 ) using SIFT apparatus or FT‐ICR for the work of Staneke et al Little is known about the reactivity of the newest HFC, although O − reactivity with HFC 134a and HFC 152a has been studied by Peverall et al, but, to our knowledge, nothing on the recent HFO molecules.…”