FORMATION AND CHEMISTRY OF RADICAL-ANIONS IN THE GAS-PHASE

Citation
M. Born et al., FORMATION AND CHEMISTRY OF RADICAL-ANIONS IN THE GAS-PHASE, Mass spectrometry reviews, 16(4), 1997, pp. 181-200
Citations number
123
Language
INGLESE
art.tipo
Review
Journal title
ISSN journal
0277-7037
Volume
16
Issue
4
Year of publication
1997
Pages
181 - 200
Database
ISI
SICI code
0277-7037(1997)16:4<181:FACORI>2.0.ZU;2-K
Abstract
The research concerned with the ion/molecule chemistry of radical anio ns is reviewed together with the thermochemical properties of these io ns and the related neutral species. Attention has been given to the fo rmation of radical anions in the gas phase by various pathways, such a s (dissociative) electron attachment and bimolecular reactions. A brie f discussion of the electron affinity of the neutral species related t o a given radical anion has been included because this parameter is im portant for the discussion of the finding that an HA(.) radical is oft en more acidic than the related H(2)A molecule. In addition, the therm ochemical properties form the basis for a discussion of the various pr ocesses that may occur in reactions of radical anions with organic mol ecules. In particular, electron transfer proton transfer, and hydrogen atom abstraction reactions have been described for selected radical a nions. Other processes that have been reviewed include S(N)2 substitut ion and an attack on a carbonyl function in an organic molecule. The i nterplay between these latter two processes has been described for the reactions of some halogen-substituted carbene radical anions with the methyl ester of trifluoroacetic acid and dimethyl carbonate. The stru ctural characterization of radical anions, distonic radical anions in particular, is summarized with an emphasis on methods such as isomer s pecific ion/molecule reactions and collision-induced dissociation or c harge-reversal processes. (C) 1998 John Wiley & Sons, Inc., Mass Spect rom Rev 16, 181-200, 1997.