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A selected ion flow tube study of the ion-molecule reactions of monochloroethene, trichloroethene and tetrachloroethene

Mikhailov, Victor A. and Parkes, M. A. and Tuckett, R. P. and Mayhew, C. A. and Simpson, M. J. (2008) A selected ion flow tube study of the ion-molecule reactions of monochloroethene, trichloroethene and tetrachloroethene. The Journal of Physical Chemistry A, 112. pp. 9012-9022. ISSN 1089-5639

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URL of Published Version: http://pubs.acs.org/doi/abs/10.1021/jp804443v

Identification Number/DOI: doi:10.1021/jp804443v

Data for the rate coefficients and product cations of the reactions of a large number of atomic and small molecular cations with monochloroethene, trichloroethene and tetrachloroethene in a selected ion flow tube at 298 K are reported. The recombination energy of the ions range from 6.27 eV (H\(_3\)O\(^+\)) through to 21.56 eV (Ne\(^+\)). Collisional rate coefficients are calculated by modified average dipole orientation theory and compared with experimental values. Thermochemistry and mass balance predict the most feasible neutral products. Together with previously reported results for the three isomers of dichloroethene (J. Phys. Chem. A., 2006, 110, 5760), the fragment ion branching ratios have been compared with those from threshold photoelectron photoion coincidence spectroscopy over the photon energy range 9-22 eV to determine the importance or otherwise of long-range charge transfer. For ions with recombination energy in excess of the ionisation energy of the chloroethene, charge transfer is energetically allowed. The similarity of the branching ratios from the two experiments suggest that long-range charge transfer is dominant. For ions with recombination energy less than the ionisation energy, charge transfer is not allowed; chemical reaction can only occur following formation of an ion-molecule complex, where steric effects are more significant. The products that are now formed and their percentage yield is a complex interplay between the number and position of the chlorine atoms with respect to the C=C bond, where inductive and conjugation effects can be important.

Type of Work:Article
Date:2008 (Publication)
School/Faculty:Schools (1998 to 2008) > School of Chemical Sciences
Department:School of Chemistry, School of Physics
Subjects:QD Chemistry
QC Physics
Institution:University of Birmingham
Copyright Holders:American Chemical Society
ID Code:750
Refereed:YES
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