SELECTED-ION FLOW TUBE STUDIES OF THE GAS-PHASE REACTIONS OF O-CENTER-DOT-, O-2(CENTER-DOT-) AND OH- WITH A VARIETY OF BROMINATED COMPOUNDS

The reactions of fourteen bromine-containing molecules, CH3Br, CH2Br2, CHBrCl2, CHBr2Cl, C2H5Br, CH2BrCH2Br, CH2BrCH2Cl, CF3Br, CF2Br2, CFBr 3, CBrClF2, CFBr2Cl, CCl3Br and CF2BrCF2Br, with the anions O-.-, O-2( .-) and OH- in a 0.5 Torr helium buffer gas have been studied at 300 K using a selected ion flow tube. Reaction rate coefficients and branch ing ratios are presented. Several distinct reaction processes are obse rved among the large number of reactions studied, including nucleophil ic attack, proton transfer, abstraction, and dissociative and non-diss ociative electron transfer (within or out of a reaction complex). Of t he forty-two bimolecular reactions, the rates of only two are signific antly below the collisional rate and, for these two, competitive three -body processes are observed. Many of the reactions reported here have not previously been studied. This study, therefore, presents new data which provide additional insight into the reactions of anions with ha logenated species.