Reaction pathways in the gas phase negative ion chemistry of chlorinated ethenes

The photoionization dynamics of the three structural isomers of dichloroethene

“…We also compared the yields for each reaction to the ion yields from a photon-induced threshold photoelectron photoion coincidence (TPEPICO) study to determine the importance of long-range charge transfer in such reactions [3,4]. We have previously studied the reactions of these three isomers with small anions [5]. Significant variations between the reactions of the three isomers were observed, but they were different in nature to the isomeric effects observed in the cation study.…”

Isomeric Effects in the Gas-Phase Reactions of Dichloroethene, C2H2Cl2, with a Series of Cations

“…This has been reported by us in a paper dealing with a series of anion reactions with the three structural isomers of dichloroethene: 1,1-C 2 H 2 Cl 2 , cis-1,2-C 2 H 2 Cl 2 and trans-1,2-C 2 H 2 Cl 2 . 1 Dichloroethenes have attracted recent attention as environmental pollutants since they are toxic and potential human carcinogens. Several studies have been undertaken on the oxidation of various chloroethenes, including dichloroethenes, by neutral atmospheric radicals, 2-8 with some reporting the influence of the isomeric structure of dichloroethene on the reaction pathways.…”

“…1 A striking feature of these reactions is that the vinyl anion, C 2 HCl 2 − is observed only for trans-1,2-C 2 H 2 Cl 2 where it is the major product, whilst Cl − is the major product from the 1,1-and cis-1,2-isomers. The difference has been explained by the probable existence of a higher barrier to the loss of Cl − from the initially-formed vinyl anion in the case of trans-1,2-C 2 H 2 Cl 2 .…”

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

“…This assumption is supported by the available data on HOCl − ion, which describe HOCl − as a chloride + radical complex . HOCl − has also been found as a minor product of the reaction of O − with Z‐1,2‐dichloroethene . It is worth noting the similarity between Cl 2 O − formation from CF 2 Cl 2 and O − and HOCl − formation from CHF 2 Cl and O − : The presence of H instead of Cl in the neutral molecule leads to [chloride + HO] instead of [chloride + ClO] radical complexes.…”

“…74 HOCl − has also been found as a minor product of the reaction of O − with Z-1,2dichloroethene. 75 It is worth noting the similarity between Addition of Cl − on the neutral molecule was not observed.…”